Cellular Internet Routers

[picklemonkey]

does anybody have any experience with these? for example, one of these:

http://www.rfwel.com/shop/product.php?productid=1&cat=105&page=1

looks like I might be helping someone pick out some service and a router for their home since they have no other high-speed Internet alternatives. does anybody know how well they work? are the download speeds decent on cellular cards these days? etc