I have a number of different makes and models of mounts, anti vibe, they really do work pretty well but I use the GP adjustables just as often without problems so I agree, they aren't something you must have. Out of the mounts I have tried, the best of the bunch was the Jtec anti vibe. It takes a bit more work to mount but it was well worth the trouble. I used it on a CG Extra with a YS 1.40 sport and the air frame didn't even shake. I have an OS 1.20 beam mounted, the old wooden beams that run through the fuse and it isn't bad at all.
4 bladed props?? I haven't seen any but Groupner {spelling} makes a great 3 blade and it can be dyed for color matching, dark colors. I just tested there 14X7 on the plane I'm running a OS 1.20 on, it was OK but not the prop I was looking for, I'm still testing but 3 blades need to be ordered so I'm back to the APC 2 blades. I would like to test the Groupner in a 15X7 or 6 though just to see if one of them would be my magic prop??