Hey - I had one of those for ten years until it broke. I loved it! Small, loud and good sounding. Had two 1x12" Marshall cabs when touring with it. One thing I did not like though was the loud hiss, but I guess that won't be part of the modeling
I will never forget my GK because I used it when being a session player on a studio recording from where a radio hit eventually came out and every time I hear a song on the radio with me am my 250 ml I miss it badly. I picked that combo by ear in a music store; it was the amp that sounded best of all and at the time it was new and I knew nothing about it. What caught my ear was the low latency, much faster response than the tube amps I had played up until then. Solid state design and small 10" built-in speakers, very fast and responsive amp. He, he... sorry for the nostalgic outburst.