Yongnuo YN 565 as main flash?

I've been using a few generic branded flashes for off camera work but need something for on camera use for an upcoming wedding that has a bit more power. My budget is tight and these are pretty cheap on ebay at under £100, but reviews are a bit hit or miss. Other options are Nissin 622 or Metz 50 AF-1 but they are more expensive.

Experiences and opinions please. Would you have one as your only flash over the others mentioned? Maybe even 2 of them with one as a backup?

I only have 1 565EX at the moment. So, it's my only on-camera flash - if I really need one on my camera. I also have a 400ws strobe, but that's a different story. I used the 565EX on-camera for a few times just to fool around with ettl settings, and to obviously test it out. It worked perfectly fine. However, since I got my radio triggers in, I've never used it on-camera - which was my goal to begin with. Also, the 400ws strobe that I have has a LI-ION battery pack that I sometimes use on my 565EX (with power cable of course). Works like a charm. I bought mine from ebay from thephotogadget I believe it was.

I bought one around 9 months ago as a backup to my 580EX ii. ETTL exposure was never quite right. 100 or so pops and it was DOA. Sent it back to Hong Kong and I am still waiting for repair or replacement. Product is crap. Service is worse.

I have seven 'camera-top' style flashguns from Metz (4), Canon (1) and Yongnuo (2). The ones I reach for first are invariably the YN-565EX models - in fact I lent out my Canon 580EXII long term and don't miss it at all. Perfectly happy with the YN-565EX although early models did have (well documented) capacitor problems but the post-May 2012 versions seem perfectly reliable within normal parameters. Suppliers with high turnover (HKYongnuo and ThePhotoGadget) are proving reliable from reports here and elsewhere.

If you want to buy from a UK eBay supplier, read ALL the information provided on the listing. I strongly suspect that some of them are not quite as they superficially may appear to be (ie not actually UK based at all).