@amma17 My apologies, I haven’t logged in for months and didn’t see your question! Anyway, the Terra foundation has worked well for us. We got a new mattress at about the same time as the Terra, so it’s hard to tell how much of what we feel is due to the mattress and how much is due to the foundation.
But for about two nights we used the Terra with our old mattress, and I could definitely notice an improvement in support. It almost made me want to just keep the old mattress for a couple more years.
The Terra is easy to assemble and made with thick, high-quality wood and sturdy bolts. It feels to me like it will support any mattress.
The only thing I might improve is that we got a King (so it came as two halves), but the instruction sheet has some steps that seem to only apply to Queen or Full sizes with a center rail. That confused me for a bit. But there’s an assembly video out there that makes it easier.
So I wouldn’t hesitate to recommend the Terra foundation if you need heavy-duty support.