Yes, the PAL dreamcast cases break really easily

Most often one or both of the hinges snap off, then the teeth that hold the gd-roms inside snap off after that. It really doesn't take much to do, either.. a moderate drop will pretty much destroy one.
That said, they do look really really good (imo)

I haven't been able to find any replacement cases personally, I'll keep an eye on this thread incase anyone does as I'd like a few myself.