I too sent my A1 and was sent the A2. I'm running firmware 1.22 and it seems to be doing well with 2 xbox 360s, blue ray player with netflix, 2 iphones, 3 wireless pcs, 4 wired devices.
You can always use the downgrade version of 1.15 to get below 1.2x and then downgrade further to 1.02. It's up to you and it's nice to have the option.