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Great for amplifying GPS
Makes it a pleasure to listen to the books-on-tape that I've downloaded onto my GPS unit. I suppose any tape adapter might work as well, but this one is affordable pluc it's a Sony.

Great price for a great device
I borrowed two similar items from a friend of mine to test out the quality before I bought one for myself - Sony and Monster brands. I eventually purchased a Sony for myself and am very pleased with my decision. The Sony is a high-quality product that (unlike some other brands that I have read about in user reviews and in my experience with the Monster unit) does not make a loud clicking sound as it plays, presumably from the tape player attempting to change to the B side. The sound quality is excellent. I've used the Sony adapter on a few long road trips already without incident and intend to use it for plenty more. Good job Sony.

Compatibility Issues With Autoreverse
There should be a warning before buying this product that it is not compatible with tape players with the autoreverse sides feature. It never worked in my 1999 Toyota Camry. From the moment I put it in the cassette player, it constantly changed sides until it spit the adapter back out at me.

I had some small hope when I found some instructions on how some people have fixed this issue with other adapters (removing some parts from the inside of the adapter), but there were two problems:
1. The cassette tape was stuck together with an adhesive, and not screwed together.
2. Once I got inside of it, it didn't have the part mentioned in most tutorials I found.

If you're looking to replace your current cassette adapter because of the autoreverse problem, do NOT buy this one. Buy a different one or try to fix your current cassette with this guide:
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works exactly as i expected
this works just as i thought it would. i can only hear the tape making noise when the volume is at its lowest setting, but usually road noise drowns it out completely and with the volume turned up to a comfortable level you cant hear the tape at all even when the cars not running. i did accidentally hit the skip button on my cassette player and it wouldn't stop searching until i turned the radio off and turned it back on, but that just may be a flaw with my cars radio (94 crown vic lx stock radio) I use this for my ipod classic and my only complaint is the headphone jack is a 90 degree elbow rather than straight so the wire comes out at a strange angle but that's fine. i prefer this to the FM transmitters because i never loose reception or get other stations cutting into my music. the sound is great, far better quality than i expected.

Didn't Work with my 2003 VW Jetta
I bought this to play the music in my Mp3 player inside my car. When I first put it in, I was taken back by the horrible sound quality. The volume was extremely low, the adapter itself made a loud mechanical sound, and there was a lot of background noise. After about 30 seconds or so, my Monsoon sound system showed an error on the screen and spit the adapter out. Maybe I just had a bad one, but if this is how all of them are, you're better off with an FM transmitter.