One of our PCs is a Novatech. It's not switched off very much and has been going strong since 2007 (coming up to it's 5th birthday.) We've not had a moment's trouble with it.
Also, the guys who work at Novatech are extremely helpful - both online (they have a live chat facility, which is useful. They will answer any queries/questions you might have regarding their products.) The service is also good, if you're lucky enough to have one of their stores nearby. We have a store in Cardiff, they couldn't have been more helpful when I purchased a graphics card a while back.
They seem to deliver very promptly - and in my experience, delivery has always taken place exactly as promised. (Computer arrived within 24 hours, also smaller items, such as photo-paper and that kind of thing.)
I admit, I'm a bit of a fan, but I speak as I find, and so far, I've had no grumbles at all with them.