Hi Catherine,
Well, I have some Simon Says Stamp cardstock and I like it just fine. I think it's comparable to the others, actually maybe a little bit heavier than PTI and SU. Worth the money? Eh, I think it's all overpriced some days, LOL. I am not disappointed in it at all, though.
Anyway, I have
this combo pack from them. If you PM me your address, I will send you a half sheet of each color I still have (so that's big enough to make an A2 base if you want, or to cut in half for two card fronts). I'm pretty sure I have all five colors but I am too lazy to go pull the pack out and check.