This thing is great. It was easy to install -- you have to loosen the strings, take off the bridge, but you don't need a pro to help you -- and it sounds so sweet. If you need to switch instruments regularly this isn't what you need -- it's not leaving my cello now. But it works great after installation.

Pretty good pickup, but it definitely needs a pre-amp to help with EQ AND a very high-impedence DI box (Radial makes a few nice ones). The DI is very important because without a high-impedence DI you lose significant tone/signal. That will require phantom power, by the way, but most mixing consoles come equipped with that option. I am using an Empress ParaEQ ahead of the DI and it sounds pretty natural with the cuts that the pre-amp is making in tandem with some channel EQ'ing and reverb.

In a high-volume context, you almost can't cut enough low end, especially between 100 and 200Hz. The cello will feed back in a hurry without cutting low end. You may want to consider trying to place the transducer under the treble side of the bridge. I have had to secure the end of the pickup to the tailpiece to make sure that there are no extraneous vibrations and as a result, it has affected the tone of the cello acoustically. Realistically, however, this is not something you want to leave on your cello when playing acoustically verses amplified.

Make sure you use quality 1/4" cables as well to prevent tone loss. Lastly, with IEM's, you'll want to make sure you also use a quality RF Transmitter. I'm currently stuck with an AudioTechnica unit that makes the cello sound very farty and uninspiring in my ears, but at least it sounds great in the PA. Wouldn't be an issue if I was using a Shure PSM 900 or better.

Very easy to install and use, and sounds great. I can run my cello through different amps or pedals to adjust the sound and add effects. Also very easy to plug in at a bar or performance venue instead of relying on a microphone.

I also set up an in-ear monitor so I can hear myself better than a stage monitor (and keep from having to put my ear on a tuning peg).

Really good pickup. Pickup provides a very clear sound and is easy to install. Just put the rectangular metal piece under the foot of the bridge, and put the input on the tail-piece. This thing picks up everything: arco, pizzicato, or guitar pick. This pickup does raise the bridge on the C-string side slightly, since the pickup is installed on that side of the bridge. Raised bridge doesn't effect anything about the cello. I tune up the C-string to D, so I can put the cello in D-standard (tuning in fourths instead of fifths: DGCF) so I can play metal on cello. So I'm constantly thumping the open D string (like in metal) and the pickup does awesome at picking up the staccato from pounding the open string with the bow or finger.
Pickup works great with bass and guitar amps. Got some beautiful tones out of a Fender Rumble bass amp and a Carvin v3 guitar tube amp. Also works with distortion pedals, to give a growly-acoustic tone.
This pickup is great for the price, you get what you pay for. I believe you have to actively try to destroy this pickup, it is solid and built to last. Takes literally 2 minutes to install. Get this pickup and show everyone how beautiful and expressive the cello is..

The pick up is okey, the sound is good but depends a lot on the audio engineer. If you play in a loud pop band don't expect to be comfortable with you sound. A pre amp seems almost indispensable, this mic don't have much gain, it's not loud. I play with in ear monitoring in a pop music band and therefore I don't have feedback issues. I don't hear the cello as loud and clear as I would like, but I don't know if I have to blame the mic or the audio engineer. Sometimes radio frequencies get in the signal and it makes noises. Overall it works as expected.