Have had mine for about a week now, bought brand new at a great price, open box sale. Got the full warranty. Trying to figure out the EQ, playing into my 12/6. Tried all the bangs and whistles, and , so far, the Punch button is really the only effect I like and use, along with some compression. Right now my EQ is : Gain at about 7, Volume at about 5. Low Mid, wide Q , boosted a 1 o'clock, at 250 hz, and High Mid, narrow Q , boosted at about 3 o'clock at about 2 khz. Low is at 1 o'clock, High is at 2 o'clock. Punch is on. These settings get me pretty close to the way my GB Shuttle 9.2 sounds, with a definitely louder and heftier feeling. I dunno if that is due to the Punch effect, or the extra 200 watts I'm getting into the 8 ohm, 12/6. The Kosmos effects seem to be something I probably would not use. The Crunch effect instantly adds dirt and is definitely something I don't want. Overall, I like it it, although I don't know yet if it is significantly better than my Shuttle 9.2. I definitely have to crank the Shuttle to about 3 o'clock on the Master to achieve the same ballpark volume as the MM on about a noon setting. No problems yet of any malfunctions. The supplied gig bag is cheap, as others have stated, and I've already found a substitute for it. Big test will be on the gig, of course, but, so far, a lot of bang for the buck. I should add that I have been leaving it on for several hours each day, occasionally playing through it. The fan is always on, right from power up. It gets a little warm, but nothing to worry about.