+1 on SteveC & kwd's comments. They're both spot-on. I used the same rig (hybrid>bassmax>proplatinum) as Steve for a few years with great success.
Fit is very important but also very easy. Furthermore, if you find that you want a slightly different response, just slide it in or out of the wing a little and you'll get tighter or looser sound. I found this helpful when I was in a feedbacky room- jam it in as tight as it will go and your fb will be greatly reduced.
Best of all, IIRC it's about $100 cheaper than a realist. (Full disclosure- I use a realist currently and I like it better) If you're just starting out and need something, Bob will have one in your hand in a day or 2, along w/ a very cool sticker.