I don't actively follow it anymore but I remember there being a huge fiasco over Dell's 2007fp series. A few hardware communities labeled buying one as playing "panel roulette" or "panel lotto".

It went on for a few years after its initial release so it's still semi-current although now a days I doubt anyone would be buying that model.

I remember a 100ish page thread on hardforum documenting which panels lined up with what serial numbers. I actually played the roulette and bought one off a dude. I ended up getting an s-ips panel and I still use it as my second monitor. It's not 120hz but I don't game with it.

Here's the link to the thread: http://hardforum.com/showthread.php?t=1111100

I'm sure there were/are more cases but this was the most popular one because the s-ips version of this monitor was amazing for its time. It was my first LCD purchase.