DNA-1 SMc A/B mods: More laid back?

I have read the smattering of older posts here concerning SMc's mods to the McCormack DNA amps. The reports have been very favorable in terms of improving the top end, imaging, and bass. However, I've also heard (from one other person) that the DNA becomes much more laid back with the Rev A/B mods. I'm considering upgrading my DNA-1 to Rev. A or B, but I'm concerned the mod may make my system too laid back. (My DNA currently drives Khorus through Golden Cross -- the presentation is just about where I want it now.) I won't be able to try before I buy. Another option would be to buy a different amp. For those of you who've spent time with a DNA-1.A or 1.B, I would be very grateful for your thoughts about how the SMc upgrades change overall presentation of the amp. Also, for those of you who have not posted your impressions of your modified DNAs before, I would also like to hear what you think of the overall benefits of having the DNA reworked by SMc. Anything you didn't like about the mods? What was the biggest performance gain in your system? Thanks, Don