No, but I can monitor in real time with my POD and the sims in it, and then basically insert amp sims lately, effectively reamping it, so to me at least it doesn't matter if I can or cannot monitor with non Line 6 amp sims.
But anyway, call me weird but I preferred the sound of the POD just going through the USB 2.0 connection directly, because I've started tweaking that anyway and if I started using 8505+impulses I'd have to learn from scratch how to tweak them to sound good. After you spend enough time with it, at least in my case, I kinda began to really like how it sounded digital and not like tube amps. Good, but just different to real tubes.
Of course, if you're gonna want to monitor with amp sims, Firewire is best, but so far I can get 2.67ms of latency with my POD recording directly onto my computer.