A challenge to put together but worth it, it's a big, solid, substantial monster with plenty of room for stuff.  We bought it because we wanted to be able to make compost for most of the year in a temperate climate and it definitely heats up nicely even when it's cold and damp out (40's for us, we haven't tested it out that much colder).  It's pretty big, super high quality and kind of fun to look at.

Only drawbacks are the assembly (you'll be much better off if you use two people, some of the screwing in is a little unwieldy) and that the doors are pretty hard to open for me (but that does make it more secure, so it's a 2-sided coin).  

It does seem like it'll last forever, it's that sturdy.