I have a very limited frame of reference with Boss products in general. I owned an ME-50 a few years ago, and I remember it sounding OK, but only OK. I have a Boss Phase Shifter (PS-3?) that has a couple unique sounds you can't get on any other pedal, but it sounds really thin. My dad owns a Pod, so I have a lot of experience with the effects on there, too. Oh, and I've demoed most Boss pedals at Guitar Centers, but that's not the same experience as actually owning, you know?
Anyway, in my experience, the Nova System has a warmth to it that has me gladly surprised. For example, I had come to terms that I wasn't going to like the phaser based on the reviews I'd read, but not only do I like it, I love it! I can get it to sound a lot like my Phase 90. Like I said, I use the Nova System running into my clean channel, so when playing clean, it sounds great. However, when I engage the drive circuit (which is analog and sounds really, really cool), the phaser comes afterward, and I much prefer the sound of a phaser in front of any dirt. (Haha, you'd never guess what my favorite modulation effect is, would you? I blame growing up listening to Incubus!)
I've only played it into my amp once, and I live in an apartment, so it was barely audible. It sounds really good, so far, though. I've been talking about getting this piece of gear for months. This isn't even my first thread on it. Because I am so stoked about it, I will keep updating this tread as I learn new things.
Oh, side note. I'm borrowing a 3/4 back 1x12 from my dad, and it sounds AWESOME with my little 5:25 sitting on top. I can't wait to try a Celestion Gold in my amp next. (Probably won't have funds for a while, but I've wanted one for about a year, and the most recent thread on it only makes me want one more!)
Cheers, guys.