Another vote for Vector. I had fond memories of playing it when it was brand new as a teenager. One came up on Ebay locally, having been dumped in a garage for many years. After spending loads of time and money getting it to work again , I thought "What a clunky pile of $hit, did I really enjoy playing this back in the day!" It took ages to get rid of it, and it sold for a loss too.

One I haven't seen mentioned yet was The Shadow. Several years ago I traded a nice TSPP for a Shadow (plus cash) without ever previously playing one. As soon as I set it up indoors and started playing it I realised I made a mistake - it lasted just a few days set up indoors before being banished folded up in the garage and quickly sold on.

The game just felt a bit clunky on the ramps, and I couldn't work the upper playfield well. I didn't like the translite or the artwork on the playfield either. Such a disappointment after getting rid of TSPP for it. It wasn't just the machine I had, as I tried several other Shadows at shows and in collections and they still felt the same.