I used my Duoverb onstage quite a bit, it was a real good amp. Never used the Vetta I had onstage it just didn't work logistically for me but I have no doubt it would've been fine onstage, it is a tremendous amplifier.
I have heard guys get great sounds out of them onstage and I have heard guys get crap out of them just like about ever other amplifier ever made. It is a tool learn how to use it and it will serve you well.
I am a Line6 fan.
I never fully understood why people avoid these amps. I happen to have one and I can get some decent tones out of it.
I've gotten a lot of use out of with my Spider onstage. I use it when my normal rig is too large for the venue. Decent recording amp, too.
I had a Vetta and as much as I loved the all the features and the versatility that it afforded; I just couldn't get it to sound right. It was a constant tweak fest and even when I did manage to get the tone right there was still 'something' missing. I ended up selling it and replacing it with the PodXt Live and ran it straight into the poweramp section of a good clean tube amp when I wanted to use the amp modeling.
I liked the Spiders I've played through though
I love my Flextone III Plus. The only thing I wish it had is a model bank of OD/Dist. boxes. I have to depend on the amp model's gain and sometimes it's not enough.
It should take an OD stomp fairly well. My cheap Bad Monkey pedal sounds pretty good with the PODXT.
I had a Vetta and as much as I loved the all the features and the versatility that it afforded; I just couldn't get it to sound right. It was a constant tweak fest and even when I did manage to get the tone right there was still 'something' missing. I ended up selling it and replacing it with the PodXt Live and ran it straight into the poweramp section of a good clean tube amp when I wanted to use the amp modeling.
I liked the Spiders I've played through though
great for the house, sh*t for stage. just my ever so humble opinion.