Should I buy Poker Tracker?

I've heard people say that PT isn't really that useful for NL. PT doesnt work with the site I'm on, but I think I'm going to be switching sites soon. This means I'll have the opportunity to start using it, if I decide it's worth it.... Is it worth it, at this stage in my game?

Right now I'm playing $400NL full ring, 5 tables.

Yes

I have had it for a couple of weeks and I have found it very useful (but I am at full $25 NL). I like the analysis it will do, and it is surprising the hands you would think you would win money on versus the hands you would lose money on that DON'T turn out that way. For example, my least profitable hands based on BB/HAND are JJ, 99, AKo. Now I can isolate those hands, sutdy histories, and see exactly how I am overplaying them and hopefully fix those leaks. I can see which positions I am losing money in, pull up those hands, study, etc. The number of things it monitors is amazing. I know I couldn't maintain those type of records without it....I think it is well worth the money spent.

Not useful ? What the hell!

No doubt about this... Buy it.

you have to be ready to commit a certain amount of time each day to review of your PT stats and hands; otherwise, it's a waste.