Looks interesting, I use herhoopstats.com and basketball-reference.com quite a bit and they are quite good, but looks like I need to add this one as well. To me the main advantage of advanced stats is when they adjust for both pace and level of competition, and sometimes they do. Player efficiency ratings, (PER) do a good job of coming up with a stat that measures overall effectiveness, at least with regards to anything that has a statistic relating to it, and it adjusts for pace by measuring against a common denominator like per 100 possessions.
What it lacks, is anything that can't be measured with a stat, and an adjustment for the level of competition. I think the BPM stat on this site does that, as a similar stat on the basketball-reference site does also. Anyway looks interesting.