That's not too much of a deal-breaker, however, as you can easily purchase gel seats at sporting stores.
The lack of PS3 Slim backwards compatible support is unfortunate, but it is unlikely to be something that is a deal-breaker for most people.
Of course, this may not be a deal breaker for hardcore Tetris fans.
It might not be a big issue for some people to be missing the original box or the instruction booklet, but it can be a big deal breaker for others.
It shows disrespect for the person and is often a real deal breaker.