If you're considering using a modeler with a tube amp in the effects loop return as a power amp, then hopefully this video will give you an idea of how it sounds. I compare with / without IR's and also a reference clip recorded direct with no tube amp.
Follow up video with Axe-Fx Power Amp modeling disabled:
https://www.youtube.com/watch?v=ffQy2mKHtnE
You can compare this to a solid state Matrix GT800FX here:
https://www.youtube.com/watch?v=FHvstx3z_O8
https://www.youtube.com/watch?v=_nbBd2zaGr0
Hit "Subscribe" for more videos!
http://www.youtube.com/subscription_center?add_user=kleydj13