Not registered, because I've registered AWeb (before open source) and Voyager. At the time, for each product, it was the best decision. I get the feeling that at $55 they are trying to PUNISH those who would otherwise register.
I'm a little bit bemused regarding the fuss over price. Anyone would think the price has gone up, but it hasn't (ok, the upgrade price is slightly higher now). I realize people have forgotten what IB2.2 sold for, as it's nearly 3 years ago, but until not so long ago HiSoft were still selling IB2.2 for £34.95. Now, from IOSPIRIT, IB2.3 costs £34.09.