I've tested the Laney IRT Studio over the last 4 months in different situations.
By default, I use the amp to practice at home. Here, the 1W input is really good to produce some slight overdrive sounds (but in combination with an old 1x12 Marshall-Box already to loud ;) ). The crunch channel is...low gain (for a metal guy), but very well defined. I also play an Engl Victor Smolski - the "play feeling" is nearly as good when you shape the tone with the pick (but sounds absolut different, of courcse). The High gain channel produces exactly this - high gain. It's not a high gain monster, but since it has a booster you should be able to get more gain?
Not the best idea.
The Booster will push the signal, but also (depending on the channel) narrow down the SNR of the drive channel. You will get a thick sound, for sure, but also you will experience some noise problems.
The test in the rehearsal room shows that the 15W are enough if you want to play in small clubs. That came unexpected to me, since I haven't heard a 15W valve tube amp before in a session.
The clean channel there will be obvious mor an overdrive channel, crunch becomes thicker, but keeps a lot of his definition, and the high gain channel then has not my kind of sound (again, I play black metal and at some times Hard Rock ;) ).
Now to the recording site:
By default, most of my jamming is recorded using the USB out. This was a littlbe bit hard at first (got a ground loop), but now it works finde. I didn't have checked the internal box simulation, since I use my own impulse response.
You also get the "clean" tone (completly unprocessed and bypassed from most of the amps inner sound shaping), which is rather useful for re-amping.
This is real fun - by not connecting the speakers the internal shunt is activated, and recording the reamped signal without speaker simulation creates really useful tones from all three channels.
To make it short:
It's definitly the amplifier I hoped it will be. Perfect for practice as well as reamp machine. It lives in perfect harmony with my Engl.