What lets you down when it comes to cockpits

So I have been using an aluminium profile rig for a while now, and I love it.

But one thing that I have found frustrating is the mounting system for seats. I know the slider bars are a general standard for most brands, but It was very annoying readjusting placements for mounting a new seat that was a different style, I was just wondering who else hates the current market mounting ideas and what other problems people typically get with products they have purchased.