No problem.
I'm usually anything but an 'early adaptor', and researched my purchase thoroughly before going with the XA1. To be honest, the largest factor in my decision to buy an XA1 over the A1 was that I bought in early May, right after the initial release in April, and the A1's were hard to find and I got a good price on my XA1. I'm happy with my decision.
In addition to the items pointed out by William, the XA1 was double walled construction (heavier, more solid feel) and large rubber feet to help agains vibration. And the remote is motion sensitive backlit, making the buttons easier to find in dim light. But, the "guts" (audio / video componets) are exactly the same for the A1/XA1/D1/RCA models. The same firmware upgrades work on all 4 models. I also agree the load times are way overblown. Sure, it takes 2-3 times the amount of time most standard DVD players take to start up & play a disk. So? I just start up my HD DVD player first and then get the TV & receiver and food & beverages ready to go.
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For myself, if I were making my first HD DVD player purchase now, if I could find an XA1 player for around $550, I would still go with an XA1. But, that's just my thinking. Whichever way you decide, enjoy!