“Quality” is a bit of nebulous term taking into account the entirety of an adjustable bed base unit, but I can tell you a bit about the Rize lineup (disclaimer: I offer Rize and Leggett bases at my store).
The first thing I’d offer up is that the major players domestically (like Leggett and Platt, Rize, Reverie, Ergomotion) all do a pretty good job. I am seeing a bit of a difference the past two years with a “race to the bottom” of new items, mostly imports (not that this makes them bad by default), to capitalize on the popularity of adjustable bed bases and attempts to get the price points lower and lower. Less powerful and less refined motors, less steel, cheaper steel, poorer welds, and so on. Granted, power base motors are under load for a just a few seconds as they adjust up and down, but you still want to take a look underneath any item you’re considering to look at the mechanism and how it’s put together. There is no one “best” manner of designing a base structure (and certainly some new interesting methods such as Yaasa in articulation and ability to be UPS-able), but you want to make sure than anything you’re considering at least visually appears to be solid and put together well.
The Rize line does use 850 lb lift capacity motors across their entire line, and they do use a decent amount of steel in their frame networks. Their motors are quiet and “torquey” - they’re neither the fastest nor the slowest in adjustment speed. Like most brands, your choice would come down to which bells and whistles you deem necessary and worthy of your hard-earned Benjamins.
I’ve had very few issues the past 25 years with any of the adjustable bed brands I’ve offered. With most adjustable bed bases, if you have an issue it will tend to crop up earlier in your ownership, and quite often can be a result of how the product was handled during shipping (something accidentally coming loose, item mishandled by transit company), and this would usually be covered early on by most manufacturer’s warranties. Even if you did have a motor or massage unit go bad (maybe you had a power surge) and had to replace it yourself, most bases are quite “plug and play” in replacing componentry and simple enough to do on your own, although it just isn’t a common thing with most of the better companies out there.
Overall, I’ve been very happy with Rize, but I’m also happy with my Leggett and Platt offerings, and if I offered other brands such as Reverie or Ergomotion I’d probably be happy as well. Without meaning to sound solicitous, if you have specific questions about a certain Rize model, you’re more than welcome to contact me at my business and I’ll be happy to answer questions about that or any other things about adjustable bed bases.
There is more information from Phoenix about choosing an adjustable bed in post #3 here that also can be quite useful.
I hope that general information helps you out.