Just got some this month for the Formula. The vinyl and stitching are real nice and the place is good to deal with.
2 issues: They are very wide, I have a 40" waist (I know, I'm back at the gym

) and I have about 3 inches clearance in them. If you order you might want to ask that they be made narrower to hold better. I like to kind of push into a bolster for rough water.
The other thing is the latches for the bottom-basically 2 small pieces of tube that rotate to lock the seat up-they seem sturdy but a little primitive.
The welding on the frames is nice and the mounts are full length and seem real study.
Overall since they are about 1/2 what the nearest competitor wants they are a pretty good value.
BTW ask for the OSO discount-should save you a little scratch