If you're really hard up for cash and need a cab they'll get the job done. I usually fall into the former category, so I got a Seismic 4x10 at the local music store last year in a trade for some PA speakers I had. I personally think its kind of dull sounding, they use cheap Chinese made drivers, and from what I've read the cabs aren't the most durable.
It works, but I think there are better options for not a lot more.
"Junk is always best"- Kurt Cobain, Guitar World Magazine 1993