Never played arcanum. but since it's 6$ and so many people claims it's great i thik i'll give it a try. just bought it!
i've read it's pretty buggy, but here at gog we have it packed with latest patch i assume.
so it's probably more stable and bug free than Daggerfall ;)
...oh, GOG - when we'll have Bethesda here? arena and daggerfall are free but it would be awesome to play Terminator serie once again... (and morrowind GOTY... i have polish version so GOG english version woud be just what i need for mods)