Now that I’ve had my adjustable base for a couple of months, I have some thoughts to share with any of you who may be considering one. It’s a big investment, so the more you know…
You will see basically the same frame with a different name in several stores. This is because Ergomotion and other manufacturers do private branding. Like mattresses, it makes it harder to compare so you just have to compare features. I didn’t know until my printed receipt was handed to me that the base was non-returnable, so be sure to ask. I purchased the extended warranty (10 years) since it was reasonable and there are so many motors and moving parts. Don’t let them tell you that you need special sheets that they also sell. As long as your fitted sheet has full-perimeter elastic and is deep enough to go underneath the mattress a few inches, you’re good.
First of all, consider your sleeping partner, if any. Unless the two of you sleep in the exact same positions at all times, you’ll need to get the split king (wired together so that you can still use the “snore” button on your partner). You don’t want to be sound asleep on your stomach when your partner decides that zero-gravity is just the ticket ! If either of you is a light sleeper, the motor noise and movement might also disturb the other person’s sleep. If you have a four-legged bed mate, they might be startled and flee.
Something that never crossed my mind is the “fit”, which wasn’t obvious on the barely-bendable mattress in the showroom. The bases have two basic places that bend - at the “hip” and “knee”. Their placement is based on average heights of approximately 5’4” to 5’9”. I’m 5’1” and that throws things off a bit. If I have the foot of the bed elevated, I have to scoot down so that my knee bend is where the bed bends, which has my backside heading up the incline and the lumbar support mid-back. Full zero-gravity folds me like a taco. With that said, most models are infinitely adjustable and have buttons for you to program at least one custom pre-set position. I just went to zero-g, then backed it off a few clicks and created a pre-set, then a few more clicks and created another (which is my go-to).
Some models have a section of about 4” at the top that isn’t an obvious “joint” but that automatically articulates as the head is raised. I imagine it’s intended for reading in bed but taller people may find that this forward tilt of the head is uncomfortable for sleep in any position that has the head elevated. I’m so short that It’s above the top of my head, so not a problem.
Don’t feel like you have to get the most expensive model with all the bells and whistles. If you don’t have lower back issues, don’t worry about adjustable lumbar support. It’s nice, but probably not a deal-breaker for most. The “massage” function is actually various frequencies of vibration and it’s pretty noisy. It’s not going to give you the same results as a masseuse but it can be relaxing and most likely improves circulation on the boldest setting. And there is actually such a thing as “vibration therapy”, so there’s that 
If your sole quest is to elevate the head of your bed or bend your knees a bit without a pillow, you could certainly skip this upgrade.
The thinner and more flexible your mattress, the more you will realize the features of an adjustable base. You see them in showrooms with a 16” mattress that barely flexes. Total waste. I have 8” of latex and the bends are bends, not mere suggestions. Latex and memory foam are ideal for their flexibility. Micro-coils would work, too. Beyond that I don’t think it’s a good marriage.
If you suffer from GERD or acid reflux, this is SO much more comfortable than the straight slant created by bricks under the headboard. If you have obstructive sleep apnea you might see a slight improvement in your AHI with the head elevated. Ditto for snoring (hence the “snore” button that raises your partner’s upper body a bit) or a cough that gets worse when you lie flat. Have a cold, the flu or allergies? You’ll be less stuffy in the morning if your head is slightly elevated (my morning headaches have vanished). If you have congestive heart failure or other health issues that cause swelling in the feet, you can comfortably elevate them. If you have hip bursitis, however, be forewarned that zero-gravity is like sitting in a chair all night - and you know what that does.
With all of its quirks and caveats, I’m still very glad that I made the investment. My primary issue was being a stomach sleeper no longer able to do so, but unable to fall asleep on my back. This was compounded by a number of pain issues that turned me into a human rotisserie for most of the night, trying to find a comfortable position. Between the comfort of the latex and the positioning of the base, I can usually sleep the first half of the night without waking and then have the option to easily reposition.