I am absolutely loving mine!
The FX is not some average fizz box loaded with lots of blinking lights and cool displays. This gem is true pro audio stuff, equally at home on a stage as it is in a studio.
It's a bit expensive, but worth every penny for those who seek excellent sound with extreme versatility. The FX Standard is currently going for around $1500, the Ultra around $2000. The Ultra has a lot more processing power and some effects the Standard doesn't, but a Standard should suit most typical players. I paid $2200 for my Germino Club 40 - a great sounding amp, but a one trick pony. With that considered, $1500 isn't too bad for a horse that can deal cards.
Best amp oriented purchase I've ever made, and it anchors my new rig. : Fractal Audio hit a stadium clearing home run with the FX.
For those considering it, feel free to post or PM me. I can give you the straight skinny on it and relate my experiences with it.
Guitars: 2008 Gibson SG Classic, 2006 Gibson Les Paul Standard LE, 2002 Gibson SG Supreme, 2001 Gibson Les Paul Studio Plus, 1996 Les Paul Studio Gem, American Deluxe Double Fat Strat, Bluesville "Super" Strat Copy, MIK Fender "Limited Edition" Tele, JD Bluesville "Night Pilot", Yamaha AES 820, Steinberger Spirit GT Pro, Taylor 355CE, Ovation 1897 Adamas, Ovation CC057 Celebrity
Amps: Axe FX centered rack rig, Mesa 4x12 cab. Germino Club 40, Johnson JM150 Millennium, Johnson JM250 Millennium, Gibson Titan Medalist Frankenstein.
Effects: Tonebone Trimode, EH Holy Grail, Boss CH-1, Dunlop Crybaby Classic, Framptone Amp Switcher, THD Hot Plate, Yamaha AG Stomp Acoustic Processor, Boss BCB-60 Pedal Board.