I'm a confirmed GK user with a 400RB and two 200MB's. I first saw this amp sitting in the store before I read any reviews and gave it a try. I was totally blown away by the deep tone and the headroom with the amp alone and just had to have it after hooking up a 15" cab. I have gigged this amp and even the sax player had to know what the heck it was. I like to see the look on their face when I tell them to pick it up, what a relief from the Boogie cabs I use with my 400RB. This is an amazing tone machine with a fretless jazz and a p-bass. It's going to take some time to get the tone I want with the URB but I know it's there.

I did play at the store for 30 minutes and If you want a portable, lightweight and very powerful combo this is your final search for a great bass combo. It's a 2x10 speakers with a piezo tweeter and I can tell you...OMG! what a low bass response and a beaultiful midrange! I don't like Piezo tweeters but if you want a hi-fi sound this amp is able to reproduce.Very good for upright basses too. and the price you can't beat. I did play in markbass combos and i did feel much more power and response on this amp and the weight it's the same of the markbass combos you can't tell which is the lighter one. and this amp has 50w more power and has better dimensions for a good sound ambience. Believe me, You won't regret! buy now.

I PICKED UP THE GK MB200 just ysterday and I don't usally give my apenioun on anything that I use for at least one year. This amp is just what I've been looking for. It is light and the bottom end is great. I played about four hours at the house. I can't wait to gigg it. If you are an older basses like me, you'll love it. oh yes It's got the stuff to do the job. Put a 15" cabnet and it will light up drummer.

I tried this combo out in the store. I was blown away with the low end and the high crisp sound of the tweeter. I'm a GK fan and user. I would like to have this amp for gigs when I have to play one gig and break my rig down fast to get to the next one. This little monster is loud enough to play without turning up past 5 Wow!! I played on it for two hours.You can lift this baby with two fingers and run with it. What a pleasure not to dread packing up and setting up Thanks GK for being practical Good things do come in small packages I'm sold