Picks up every sound on my Gretch resonator guitar. String noise, slide noise, sending back.

Would not stick on and sounded like crap.

For $30 this thing is great. I love metal music so I love using this with an amp that has great distortion.

I have a cheap old Yamaha classical guitar. It's been around the block a few times, and has seen a bit of abuse, but I still love playing it. I've been wanting to add a pickup to it for a while, but I couldn't justify spending a lot of money to do so, given the quality and condition of the guitar. I've used a K&K pickup on my upright bass for years, and have been happy with that, so this seemed like a safe bet for my guitar, and the price is right. I'm happy with the sound quality so far. I'm playing through a JamMan looper into a Crate accoustic amp. I've experimented with running it through a mixing board with a built in preamp, and with a little stand alone preamp from K&K that I bought with my bass pickup, but I think I actually like the sound best when plugged straight into the amp. . . Your mileage may vary depending on your taste and the gear you're using. I'm sure that there are other options out there for amplifying a nylon string guitar that will give you a much better sound if you're willing to spend the money. For my budget and my particular needs though, this is pretty close to a perfect solution.Edit 12/18/18: The pickup is still going strong after close to 5 years of use. I upgraded to the K&K Twin Spot on that Yamaha classical that I mentioned in the original review, and the Hot Spot has seen use on a couple of ukuleles, and another nylon stringed guitar. I still think it's a fantastic pickup for any instrument that you want to amplify without spending a lot of money on a pickup. I thought I'd add a couple of notes here regarding my experiences with the Hot Spot over the last few years.I've used a couple of different varieties of double sided tape, since the stuff that came with it was long gone by the time I went to put it on a different Instrument. If you find yourself in a similar situation, use the thinnest tape you can find to get the best sound conduction. I ended up with some mounting tape from an office supply store that worked well. If/when you go to remove the pickup pry it up slowly and carefully. . . the edge of a thin guitar pick may help, or a plastic prying tool (spudger) such as you might find in an electronics repair tool set. I learned the hard way with another piezo pickup from another company how delicate they can be. I've moved the Hot Spot between different instruments at least a half dozen times without any trouble though. Another warning. . . Depending on your instrument and the adhesive you're using, you might end up damaging the finish. I pulled a few flakes of varnish off of that old Yamaha, but didn't care since it was already pretty rough anyway. I haven't had any problems with newer/glossier finishes.A new note on pre-amps. . . I bought a Fishman Platinum Pro to use with my upright bass. It happens to also work really well with both the Hot Spot and Twin Spot pickups. Again, depending on your particular situation and gear, you might not necessarily need a pre-amp, but it may help if you're not happy with the direct sound. Of course, the Fishman probably costs twice as much as any of the guitars or ukes that I've used the K&K pickups on, so it wouldn't have been something that I would have bought specifically for that purpose. Since I bought it for my upright though, which is my primary instrument, it was worth it.