My advice is,"Don't bother buying!" The bulb/element seems to be especially vulnerable, judging by stories about these things and the very fact that they now seem to supply a spare.
I bought one a couple of years ago and it came with part of the plastic base weighing about two ounces broken through. Did I just have to send that back? Oh, no! I had to repack the entire thing and send it all.
Fair enough, I got a replacement and was just getting used to cooking with it, when the bulb/element blew. I decided to return it and ask for my money back. Clearly, these things are of low quality for one reason or another, as the price nowadays would suggest. I believe you can now get them for under £30.00. As so often, you get what you pay for.
Of course, as you see above, you will get others here claiming that they are the finest thing since sliced bread and I wish them luck. So, if you're a gamblin' guy/gal, go for it, but my advice if you do is...don't throw the packaging away and make a note of how it all goes together!
I finally invested in a Remoska, a much sturdier and more reliable device. They're quite a bit more expensive, but well worth it, I feel. (I'm not a Remoska rep, by the way!)