I still have a stack of DATs from when I had a portable recorder. I'd record DJ sets when friends were playing parties. Unfortunately, I no longer have a DAT player. DAT was the first tape format that was actually listenable for me. Cassette hiss was annoying, but there was nothing else so we all listened to hiss forever. Having a tape that was that free of hiss was amazing.

There was a time period where DJs were passing around DATs of unreleased tracks, and some DJs would try to play sets from them. They had the advantage of not being destroyed by the sand on the beach, but had the distinct disadvantage of no pitch control for proper beat matching. I did have access to two studio rack mounted DAT machines that did have pitch control, but they were top of the line very expensive units which is why no DJ was ever going to have them.