Hooked up the A2 Stomp to my BluGuitar Amp 1, tried it both in the loop at line level, and into the input at instrument level.
I was mainly looking to evaluate the effects more, taking all the amp stuff out of the equation. But I did end up trying the "amp preamp only" models into the BluGuitar's poweramp, and they are similarly on the dark side like I heard going direct. But I think it's much less obvious in this scenario, and not at all unpleasant.
The Modern channel on my BluGuitar is basically a Soldano SLO. So of course I tried the SLO Lead preamp models against it and they fared pretty decently. The "HQ" version of the model does have more going for it, so I'd love to see more of the amps upgraded to these "HQ" models as they are a bit less dark and somehow more authentic sounding.
The drives worked well going into the input of my amp. I particularly liked the Barber Direct Drive model, it sounded pretty juicy going into the amp's clean channel.
I think the spring reverbs aren't particularly great as they are lacking in that drippy character, but the plates, rooms and halls are all good stuff. The specialty reverbs like shimmers and whatnot sound good but aren't all that adjustable. Most of them have the same generic settings as all the reverbs. I wish e.g the shimmer reverbs would let you adjust the pitch and mix of the shimmer effect because that would give them a lot more capability. I suppose you could build your own out of the pitch block paired with another reverb. I need to try that at some point.
The modulations can be described as "nothing bad about them, but won't make you sell your favorite modulation pedals". They are in that Boss-ish category of "utilitarian good", rather than "this thing has got its own vibe." A good thing is that all of the modulations can be tempo synced, which I find easier to work with than "your vibrato has this many Hz rate". Some even let you sync them partially, e.g on the Rotary you could set only the bass or horn driver to sync to tempo. I just wish the tempo sync option carried over when changing models, because now you need to toggle it back time every time.
It could use more options in the tremolo category as there's a basic tremolo and then a more customizable one that I suppose is meant to be a bias tremolo? Sounds good, but it's not blowing my socks off.
Similarly flangers could have more interesting options, but the ones you get are fine bread and potatoes options, and a bit more interesting tremolo+flanger model.
Choruses have your solid staples like Tri-chorus, Dimension C etc. Vibrato has a "Vibrato T" model that adapts to the input level. So you can use it to have vibrato come in or go out when your note decays. It's a nice way to do e.g some picking and then hold a chord as the vibrato adds some wobble to it.