Personally, I don't like Reptibark. It isn't very absorbent and leads to bigger messes and I've found it has a tendency to mold much quicker than aspen. Its somewhat more difficult to tell where a snake has made a mess and therefore more difficult to clean efficiently. I've also found that over time, it starts to stink a bit. Aspen is also a much better burrowing substrate in my opinion.

I have used it, and personally don't recommend it, but your experience with it may be different.