Ive been using the cab profile from Different Worlds and just love it.
The lock feature is fantastic for auditioning cabs.
Im really stoked as I usually hate the cab sim side of modellers et al for live use but Ive already found a few I really like.
I think they sound considerably better and more importantly don't feel weird when playing them. I found on the axefx the cabs felt 'stiff' compared to going power amp/ cab (with no cab sim)