I've used this once to replace a PF30 BB on my Mountain bike. This is the best tool I've found for easily and safely removing the BB without damaging the frame. Worth every Penny!
Let's face it as a home mechanic, you're not likely to use this tool very often as removing and installing bearings in your BB30 bottom bracket is not a common maintenance task. Nevertheless, I weighed the cost of doing it myself versus the local shop doing it and decided it was a worthwhile purchase at the sale price I paid. Solid Park tool quality and works as intended.
A really great and neccessary little tool... but despite the product description it does not INSTALL bearings. You also need a bearing press in order to utilize the included BB30 bushings (which I fortunately have).