To be honest, it looks like it would be just right as a backrest for me, at least for the way I sit when I normally ride. The biggest benefit, however, is that my wife, who is 4'10", keeps sliding forward. This particular pad actually looks like it matches the Deluxe tooling and we think it will give her something to rest her legs/knees/hands on to reduce sliding around on the passenger seat. We've raised the passenger pegs and installed floorboards, which helped some, and we may wind up changing the backrest from the Deluxe backrest (which seems to lean her too far back). Just looking at options and this backrest looks like it might work and I like the looks a lot better than all those other "popsickle stick" looking backrests.
Ps; I'll check out Firehouse, thanks.