Yeah, I got one of the coloured ones. IIRC, it does what it says it does but I haven't used it in anger since - it is currently shelfware.
Edit: it is not what you want to warm PCBs. The thingy Wraper has isn't very expensive and is basically just a warm air blower. [Checks] Well, it wasn't when I bought one but they seem a bit pricey now!
eBay auction: #390832778579
Yes I'm using Aoyue preheater because I already have it (bought 5+ years ago) and it works. But it's crap, especially for the money it cost. I replaced the fan inside it, because it was too noisy and vibrating like hell together with all preheater which made the boards to move by themselves
. The way how air path is made is very different from Hakko and Quick units I have taken apart. It is made so stupidly that sevrely prevents air to be pushed through. With a new fan it is actually OK, bit still noisier than should be because of the need to use high RPM fan to be able push enough air through it. Decent units are very quiet on the other hand.