Not sure about them wearing out, there's plenty of people who have been using them for years with no problems. The problem with bleeds is just that, they bleed air, meaning the wastegate begins to open before full desired boost is reached, hurting response. Ball and spring type valves hold shut until desired boost is reached and then open.
There a whole bunch of threads on that topic, and they general consensus is that the TurboTech is a better product overall. They're cheap too
Nice car by the way, it looks like a clean base to start with.