The (Paizo) ones I have are good, from an artwork point of view.
They are also all the same size (unlike, for example, WotC Dungeon Tiles). This might be a plus or a minus, depending on your taste.
They are very thin, and they are also a bit "busy". I prefer my tiles with less detail, so you can fit them together in more combinations. However, if you are happy to fit them together in the "preferred" way, they are awesome.
Personally, I'm looking forward to the campsite one. Its the perfect answer to the usual question "Do we rest up ok?"
"Um, hang on a minute while I get out my campsite tiles ...."
EDIT I also find the only way to get them is to order them from the USA. WotC tiles, on the other hand (apart from the mythical Dungeon Tiles 2) can be picked up from my FLGS.
If you are new to the whole thing, (and have a limited budget

), I suggest downloading the *free* Dungeon Tiles Mapper from the WotC website
http://www.wizards.com/default.asp?x=dnd/dnd/20061121t
and the *free* e-adventure tiles annual from Skeleton Key (available as a PDF from RPGnow.com).
http://enworld.rpgnow.com/product_info.php?manufacturers_id=433&products_id=3634&
It might be that one or the other suits you so well you don't need Paizo.
Personally, the WotC ones are currently my tile of choice.