PT3 may cost more than his BR if they release it soon. If you want it buy PT now, don't wait. The PT3 upgrade will be discounted when released if you buy PT now. Once they release PT3, you will not be able to get PT.

As for the OP, It really depends on your goal. What are your plans? If you want to get better you will need it. Sure you can get better without it, but you'll get much better, much faster with it. If your BR is $55 x 3 $165 your rolled to play $5NL at the most. If you spend $55 Your still rolled to play $5NL. But you will get your BR to the $300 or more you need to move to $25NL faster with it.

let me ask you this. How tight are you preflop? How agressive are you on the turn? Do you bet and raise more or Check and fold more? How often are you C betting? Are you a winner from UTG with AQs? How well are you playing 22-99?

You could answer these questions in 5 minutes with PT. Some of these answers could cost you more in a week than PT is worth.