Harley Benton TrueTone T-20

I needed something to connect my soprano ukulele to the computer (for recording), and I realized this might be the cheapest way to do it, if I didn't want to use any external microphones.

The pickup is very easy to place (using the accompanying sticky blue-tac-like paste), and does the job as you'd expect. For the ukulele, I realize the optimal placement is NOT under the bridge, as acoustic guitar users suggest, but right below the sound hole.

Two IMPORTANT things to consider:
1) You'll need some sort of preamp. I plugged it to my Zoom G1X, and it works flawlessly (plus, I got some cool effects).
2) Be VERY careful with feedback. I stupidly turned my guitar amp toward myself while trying to play. The pickup... picks up sound, which above a certain volume can cause some massive feedback. Turn the speaker the other way around, lower the volume, or use headphones.

Other than that, not much to add. It's not professional-grade, but it definitely does the job.

I bought this this thing to capture the acoustic sound of a semi hollow bass guitar. It requires a preamp to get a decent signal.

The build feels solid: the cable is thick, the jack socket seems sturdy and holds the guitar cable very well, no fears of the cable unplugging.
The sound is very thin and detailed which is to be expected from a piezo pickup, especially on bass. The only downside is that it's difficult to set up correctly and requires some experimentation to get a nice tone. This may be due to my specific use, but you'll get a lot of unwanted noise and clicks when touching the wooden casing or the cable even slightly. I'd still like to try this thing out on a drum shell.

Either way, for the price and build quality, I recommend this item. It does its job, but requires a little bit of experimenting and patience to get a decent result.

I bought this just to see what it was like - it's so cheap I couldn't resist. I use it on an acoustic mandolin.

Postitives - it is very robust, easy to install and easy to use. If you experiment with placement it will give good even coverage to all the strings - this is important on mandolins on which the top 'e' string is notoriously tricky to amplify.

Negatives / Queries - not completely convinced by the sound. For me it's a bit thin, tinny, hollow - although it is unmistakably the sound of a mandolin. Maybe that could be fixable or at least improved with a pre-amp, modelling amp or pedal - but those kind of moves seem to be "putting the cart before the horse". I mean if you want to play amplified it would probably be more effective to start with a well recommended electric or electro acoustic instrument. Also watch out for feedback - it can really boom!

Having said that I haven't played out or gigged with this - it might sound better in say a noisy pub along with other instruments.