I have the MIC200 tube preamp and one of my bandmates has the MIC100. We're both disappointed.

My hunch is that the tube is in there primarily so Behringer can SAY it is. I get no noticeable warming of tone, nor can I get even the slight (desired) distortion no matter the settings. I also suspect they're powering, er starving, the tube plate with the wimpy 48V phantom voltage.

The tube in my friend's MIC100 failed within a couple hours of use. I replaced the cheap, Behringer-branded, (Chinese?) tube with a NOS Phillips 12AX7, and the unit worked again, but no better.

I recently bought an ART Tube MP Studio. Same price, but a major improvement. Get the ART.

Does exactly what I need it to do - serve as a decent mic preamp but I plan on also experimenting with the different settings for both bass and guitar. Well constructed (all metal case) and easy to use. No idea how well it will hold up over time since I hear that some of the Behringer products tend to fail easily.

If your looking for a cheap tube pre, this is good option. I actually like it better then the similar ART unit. It is kinda noisy with the gain cranked up, but at normal acoustic guitar / vocal / cab micing levels its pretty quiet. If you are having noise issues make sure your inputs are set to +4db, not to -10db; -10db inputs will produce a constant buzz. Iv found this to be pretty consistent with most pre amps Iv used, not just this unit, they need to be set to +4db. I would also suggest ditching the stock no name tube for something better, like a JJ's or Ruby's.

When I first got this thing, it was perfect. No noise and nice and full tone, full frequency, everything they claim.

Like clockwork, right about a year comes along and it starts making this loud static noise, like your tv does on a horrible signal. Constantly running, at difference loudnesses on each setting. The electric Guitar setting had it the lowest, but it still came through, even when I gated it to death. I threw it out yesterday. Garbage. Plan to purchase a new one within a year. Your best bet is, if you're using your computer to record with, just get the Line6 studio port with the phantom built on. Their's has NO sound (quieter than this) and plenty of presets and effects to play with.

I bought a Tube Ultragain MIC200 for use primarily as a DI box. The unit initially worked fine, though I could never quite hear the difference when switching to different "voices" on the preamp. Controls were not as obvious as one would think, especially compared to competitors units. After two years of very light use the unit failed. Unfortunately this Behringer unit only has a one year warranty. The ART Tube MP Studio is nearly identical to the MIC200, with easier to understand controls and a longer warranty.