At age 59 I decided to try guitar synthesizer world with very limited knowledge. I bought GR-33 Roland. I was in love with the unit use Gk-2a. I turned 60 Time became an issue .sold GR-33 bought almost $500 more GR-55. within one month realized what a disappointment. It was too many sound in each group you had to constantly edit . Sold half price only 4 month old just the unit, buyer was a bass player who told me people don't need your pickup GK-3. I guess what they use is Gk-3B for bass. Buyer got a good deal because I by mistake send my Roland cable . but he told me to try GR-20 . He was right easy really no need for manuals. I used a goodin guitar. I mostly play nylon string. It is well built but input jack 13 pins was acting. BE Aware If you have goodin brand new buy an extra unit circuit board with both 13 pin and 1/4 jack because if your 13 pin acts all Godin reps only want to sell guitars not repair or parts. The local  guitar repair shop decline to install a new 13 pin input jack and told me godin them self can't fix it .So far I tried to give some of my experiences to those that are new to this . I install around 12 of these type Pick ups, the last one was an Axon 101 pick up. THIS PICK UP WON'T WORK ON YOUR NYLON STRING GUITAR. That is why I mentioned Godin because you can play 13 pin with nylon string. If you are into guitar synthesizer to play moon light Sonata Piano sound using your Guitar think again. but it is very handy if you are one of those people who likes to right his/her own piece. If you are young and eager go for it . Axon is better although no longer is made specially when the latency is an issue the sound board is no match for Roland controller . This is a good pick up with a part for Les Paul type bridge. but I rather use guitars with single saddle . you see a tiny L shape  part which is 1 mm. this is the most important part of your installation . IT IS 1 mm The distance between string and GK-3 pick up. closer you play one note receive two notes farther sensitivity problem. Therefore , if you use this jack on Les Paul remember IT IS 1 mm how you do it is your creativity. Those people on You tube use a guitar which set by experience technician. Don' expect you do it that easy Detail is the clue, it is exciting. Piano is challenging. my last installation was with Axon controller .I put GK-2a on Les Paul. Axon 101 pick up on Fender full attention to radias and use the L device. after you are done installing put on 20X magnifier to see push the L between string and your pick up . It should go in and out touching the pickup and string without lifting the string. super important. The GK-3 is good. After installing 10-12 of them I am convinced the 1mm and 20 mm distance between saddle and GK pick up are essential.. Keep that in mind, Like I said not that many choices you have. unless you want to install some other Technic such as GHOST graph tech which you can buy it in Amazon. However before making any decision look at your ability to install. Do it professionally cost money. After all this. This GK-3 is the easiest way to get in. Remember your guitar must use steel string magnetic. Now my vote which is a BUY.  Good luck and Happy new year.