I have used my VAmp to record on many occaisions, each time ending up with recordings that many could not tell were done on a sim. Also you can get full drive and overdrive at ANY volume you wish for.
Sidenote, I also own a Vox ToneLab, which is now my main amp sim. I do also own amps but love being able to record direct at room volume or less.
Just my own thoughts.
Songsmith