I contacted a local mattress maker about their beds and they indicated that they use either Bonnel, Marshall, and Offset Verticoil springs. I have seem some discussion on here about both marshal and bonnel springs, but was wondering what the general opinions are about offset verticoil springs? How is the quality of these? Thanks.

http://www.lpbeddingcomponents.com/innersprings.asp
This is Leggett and Platt's site...explains about different springs...springs look good to me!  I think that American Made is better than the cheap China crap.
Kait