POLL: Do you have a positive impression on the 64-bit platform ... plz drop a note on the hardware you use

Would be nice to have around for all considering buying stuff. Single / dual / X-cpu systems Mainboard RAM Chipset All the info you'd like to add Plz let me/others know how you dealt with problems if you had any (And yes ... I'll probably buy a AMD64/Opteron myself in the near future) Johan