The first one was D.O.A, but Thomann sorted that quickly and the second unit is working as expected.
The Jackman II is not really a substitute for a Marshall as it´s too dull and dull sounding with a lot less trebble then you would want from a Marshally amp.
If you want an amp that is nice with not too much highs or lows but a nice middle of the road, this would do nicely.
With a single coil guitar and i bright overdrive in front it will do ok at home, and perhaps a little bit better at a gig.
After I changed the preamp tube it got a little bit brighter, but not enough to convince me to keep the amp.