I have a set of the original Tact-Tiles and I love, love, love them!
That being said, I have I learned some hard lessons from a buddy's set. You really have to treat these things with kid gloves.
Right now it looks like the first set produced will be identical in every way to the original Tact-Tiles. 100% compatible.
Now if the new run really is exactly the same as the originals, please learn from our mistakes...
These things scratch pretty darn easily. I mean real easily.
My buddy treated his without much care. People used metal minis, rolled dice on them, and just used them with out thinking. After a bit we had a harder and harder time removing the dry-erase markings. They would no longer just wipe off, and he would have to use the dry-erase cleaner spray to get the markings off. Probably the final nail was that he resorted to putting them in the dishwasher to get them clean... Now they are pretty much useless.
I on the other hand, am paranoid about mine (much to the amusement and derision of my gaming friends). My rules for use are...
• All metal minis must be mounted on plastic bases.
• No rolling of dice on the Tact-Tiles.
• When stored, they must use the original packing (face to face with foam sheets in between).
Like I said. people give me a hard time for being anal about them, but my Tact-Tiles are in great shape and we love gaming with them!