Where did I say I don't like 1.5? I said it had some issues. The PJ team feels like these are rather severe issues. Having done testing, I certainly wouldn't feel 100% ok with using a piece of software that I know the authors have some issues with (beyond the normal not quite finished features or very minor bugs) to test on. How would you feel about testing a plugin on .83c? On some computers, it runs great. On others, it bombs out. The authors of PJ haven't recalled it (jabo's 1.5), but they are certainly thinking about a way to fix it asap.
As to RC status, it's a good thing. it means the author feels that it's stable enough to not die on the average gaming session. It doesn't mean it's bug free, or has 100% feature compatibility. Companies (say, microsoft) release product all the time without 100% of the bugs fixed. Sometimes they can number in the thousands, but that doesn't mean it won't work just fine for the majority of users. (Plus microsoft knows they can always release a Service Pack, which usually means more people will adopt the product due to a perception of it being more completly tested.)