I have to admit I was inclined to disagree with you but what seemed simple is perhaps not so.  e.g
after 10.Nf6+ Bf6 11.Bf6 Qf6 you'd think black's got everything he wants (good bishop, k-safety, ease of development) but after 12.Qd5!? Bb7 13.Rd1 {o-o-o!?} Qg6 14.f3 Rd8 [I think sacs of the d pawn get black nothing unless I'm missing a tactic somewhere{always a major possibility during my analyses}] White has 15.c4(!) and this seems to disorganize black enough for white to get an edge e.g. 15...b4 16.Nc2 Qg5 17.Kf2 black may be holding the balance but he's the one who must be more careful.
  So perhaps your 10...gf6!? is the way to go?  After 11.Bh6 Rg8 12. Qd2 Be6 Isn't white in a little trouble.  After 13.o-o-o Black just takes the a pawn and lives to tell the tale.  13.f4 is met by f5!? and on 13.c3 black has 13....d5!? and the position seems to open in his favor(!!).

Can this really be so?  I used Shredder here but I just don't trust this fully for black and I wonder about the tactics.  Granted black seems to be getting the dynamics that make the Sveshnikov such a favorite among active black defenders but does the black king really live happily on e8 while the center is opened?  Interesting stuff to play around with and certainly necessary for black to have a good answer for 10.Nf6+?! at below master level where I'll bet it gets played relatively frequently.

I must also admit it is both bothersome and wonderful that 10...Bf6 seems the lesser of the two moves from black's point of view.  It just seems to have so many more plusses to 10...gf6 on first look.