Hi sdmark,
There hasn’t been a lot of feedback about the Brooklyn Bedding Tri-Comfort because it’s relatively new but it’s certainly an interesting design. Their comments about it are here and there are a couple of other mentions of it on the forum (here and here) as far as I know.
Hopefully any of the members here that have purchased it will see your post and share their feedback about it.
The materials are the same as the “mostly synthetic” version of the Spindle Abscond (continuous pour Dunlop with a mostly synthetic blend) but the design is different. (Note: Spindle now only uses 100% natural continuous pour Dunlop in their mattresses). They use two 4" layers and they also custom fabricated their own 3 zone convoluted design that is unique to them with a firmer section under the pelvis/lower back where support generally needs to be greater and a softer section in the head and foot area of the mattress to “allow” the shoulders to sink in more easily. This is a little different from the 7 zone design and three inch layers that Spindle uses.
Both of them are great quality/value options for those that are looking for a lower budget alternative to Dunlop with a higher natural rubber content and I think that both of them would make a great final choice.
Phoenix