Well, it is a Tubesceamer - Enough said ;).
It is green, it has famous mids, it get loud, it is like it's "father", but man this is cheap!
I had it alongside with 808 and they sounded very similar. If You need those "middles" as a stand alone pedal or as a booster to boost things (amp or other pedals), this will surely do the work. And did I mention the great prize :).
The only downside, and the reason I traded (gave) it away and replaced it with Ibanez Tubescreamer Mini, was the size in cramped pedalboard.
Excellent price-sound -ratio and will do anything any "real brand" tube screamer will do, but with significantly lower prize. Excellent value!