Purchased a SONY BDP-S300 in early december 2007 because it came with the Pirates and Spiderman trilogies for free. I previously had bought a Tos HD-E1 just two months earlier (because my favourite movies - Matrix and the Mummy - where only available in HD DVD).
Bought a Panasonic DMP-BD50 when it came available to use new audio formats, I've given the SONY to my dad
Also replaced the HD-E1 with an HD-EP35, for the same reason (new audio formats, full HD, etc.). I keep the HD-E1 as a backup while I slowly replace my HD DVD's with Blu Rays.
I've collected some 100 HD DVD's and more than 150 Blu Rays since I started, still have to replace up to 600 DVD's though