I have a client that has 10-MR18 and 14-MR32 APs in their office environment.  I want to eliminate the older MR18 units with an AC capable model.  I was thinking of using the MR33, but read on the web that 2x2 Wave2 is not worth it, so go with 3x3 or 4x4 Wave2 (MR42).  I would also be taking advantage of MU-MIMO.   Is it okay if I mix MR42 (Wave2) and MR32 (Wave1) APs?  I want to future proof, but don't want to have to replace all 24 units. ... View more