I have two amps that while newer are essentially vintage Fender in style (see sig line). I just prefer newer boutique-level build quality over true vintage. The FX8 works fantastically well with both. In fact, I dislike channel switching. Just give me a clean amp with lots of character. The FX8 provides all the drive, comp, EQ and delay I'll ever need.
BTW, effects into a clean amp is essentially what David Gilmour does. Most folks feel that his tone is pretty good. Same for Eric Johnson, and many others.
I'm a bit of a delay freak. Especially analog BBD delays. The FX8 is the first modeler that I feel really gets those right. The latest L6 stuff is pretty good, but sounds a bit cartoonish to my ears. Just a tiny bit exaggerated. The FX8 just sounds more honest to my ears.
Also, if you use a volume pedal, there's no signal loss with the FX8. And everything just stacks better. No weird, "this effect sucks when it's placed behind (or in front of) that effect."