Yep, I mixed the previous VRs kinda similar to Shindig, but different :-) To answer the OP though, I do think that a good mxed set is a killer option for a pretty wide variety of players, and I really don't see why it isn't something more manufacturers make. Build in a little extra perimeter weigthing, a small bit of progressive offset, make sure the topline thickness "flows" through the set, and voila! You get forgiveness where you need it and control/workability in all the right places. A mixed set is also something that a mid- to high-handicapper that's dedicated to getting better can buy knowing that they can grow into them comfortably.
BTW, I went 3-5 full cavity, 6-7 split cavity, 8-PW blade. I always end up going back to them regardless of what I'm reviewing.
Oh yeah, and one last thing - what our friend jamo failed to mention in his above post was that he wrote a great review of the current VR Pro Combos. :-) I'd recommend checking it out.