Ok I picked up the Floor One this week because we had a radio show where they told me last minute I couldn't use my amp and I didn't have a modeller option. This was the cheapest solution that I could pick up same day,and had like an hour to play with it, dial in a tweedy clean tone, and then did a 25 minute set with it yesterday. So definitely not a comprehensive review, but...
It's alright. The metal case feels solid, nothing feels flimsy. The knobs are decent, the footswitches feel fine underfoot, and the little plastic round buttons have a satisfying positive click to them. There's nothing that screams cheap or unreliable.
Without referencing the manual, I could do everything I wanted - navigate the effects options, save presets etc. The screen's little but I think that's fine, it does the job. It does the decent thing of, when you've got a preset loaded and you turn a knob, the screen shows the knob's setting and where the preset's saved setting was, and it won't actually change the parameter until you roll the knob past the preset's saved position.
Sounds? Fine. I actually really like the limited number of amp models and the kinda... caricatured EL84, 34 and 6l6 voicings that can be applied to any of them. Made it easy to push things in the direction of my 5e3 clean-but-compressed tone, and the EQ controls are fairly powerful. Had a quick try with the various stomp-style effects and they're not at the line6 level of accuracy, but they work, and if you forget what they're trying to be and just scroll until you find one that works for you, they're perfectly decent.
The big Achille's heel? The tuner. It's absolutely rubbish, possibly the worst I've ever used. Say you know the low E is a bit flat. You pluck it, the screen says it's a B and it's sharp. You pluck it again, it guesses a flat G. Pluck it a few more times and it cottons on that you're trying to tune the low E, and then it tracks... very slowly... what you're doing. If you get the string in tune, and the Floor One notices for a few seconds, the screen turns white in confirmation what you've died of old age trying to establish: Yes, you are now in tune.
It was bad enough that I just didn't use the trem on my guitar during the 25 minute set, because I knew I'd only have enough time between songs to scare myself if I tried to use the tuner to check where I was.