Hmmm...Not sure. My "Transient Attack" is black faced instead of silver. Otherwise looks the same. It might be all marketing. They are good old amps and cheap. Good to keep as a backup or primary amp.
P&W #873, Fender Jazz Bass, Yamaha TRB 1005,Mesa M-6 Carbine, Hartke 3500, Ampeg 8x10, GK Neo 212II
I've got five notes only elephants can hear.