Has anybody every tried Avery sound custom earpieces?  If so, what do you think?  How do they compare to sensaphonics?  Which one would you buy?  I am about to take the plunge and I want to make sure I am going with the right vendor.

Hello,   I recently purchased a pair of Shure SE846s.  The earphones seem nice but I do not feel I am getting enough out of them.  I am hoping that a set of custom earpieces will make the difference.  I would love some feedback and I would also live some recommendations on who to go to to have...