This is the higher-end of the two new HD DVD Toshiba models, and gets high marks for its improvements on the previous model, with faster loading times, 1080p support, a smaller form factor, and a much-improved chipset for upscaling standard-definition DVDs (the HD-A2 lacks 1080p and the improved upscaling chip).
ENGADGET: Toshiba's second-gen HD-XA2 reviewed HD