Any down sides of going Borgeson vs Firm Feel?

I would at least talk to Peter at Bergman autocraft ( fabo vendor). Very sharp helpful guy, can't say enough good things about his service ( shipped to my door in ontario canada). Bought a borgeson unit off him 2 years ago and it was a world of difference compared to stock for my son's 70 swinger 360 cid. Sounds like firm feel has good ratings as well. Talk to peter...my .02