Having just transitioned to an IEM setup, and seeing the odd positive nugget about AMT preamps here on TGP (hadn't heard about much of them before I frequented TGP!!), I took a punt on the Marshall M-1 in a recent Ebay auction. I had a good listen to the Burgs demos on Youtube and figured it was worth a bash. Initial observations based on a direct play into my audio interface using the Cab Sim out + Cab Sim is REALLY good combined with the preamp - better than my Big Sky on initial playing. + Actual Marshall sounds are seriously good! Sounds more Marshall to me than my SL Drive + Stacks VERY nicely with the Blackstar LT-Metal pedal - this is the best metal sound i've ever got DI'd into my interface, seriously sweet! + Stacks ok the other distortions, but not as nice as the Blackstar - Very little clean headroom, this is a gain preamp! - This is a very bright preamp, but then the JCM800 is noted as being a bright amp so no surprise there. - Doesn't play well into the front of an amp - but that is well documented on the AMT site for the Legend 1 series. For my setup, the M-1 isn't going to work as the 'last in chain' preamp (although I think I will get by with it in rehearsal tonight, my cleans will be a bit dirty tho!), but this is a great Marshall JCM800 sim! This will be really cool to have hooked up to my living room interface for riff creation, once the gain is cranked, the sounds are really convincing! Additionally, from a recording point of view, the Blackstar LT-Metal into the M-1 was a thing of beauty, can't wait to hook that up to one of my amps FX Returns and do some recording! Anyway, I've been so impressed with this preamp, I've placed an order for the F-1 (Fender Clean) and the V-1 (Vox) preamps from the same series - the cab sim is a known quantity, so I don't think I can lose out!