I actually really dig the quickfit bands, they all give the watch quite a different look. Solid black, sporty/summery/happy green/yellow and more serious leather. A chinese blue one is also on the way.
So far my impressions:
1. Chinese yellow sillicon:
The material is more flimsy. Think of wearing the official sillicon one for a few weeks after which it gets more flexible, the chinese is that + some more. I think it actually reminds me a bit of the stock non-quickfit 935 band, Surely decent enough for day to day wear and also for running and such. The clip is set with a pushpin instead of torx (same as with the nonquickfit stock one I heard?) so that construction might a but less solid. The strapholders also are a bit more loose, but the strap stays in fine though. Excellent value for money!

2. Official black silicon:
More rugged then the chinese one, a little bit too rugged/uncomfortable the first day but it loosens up quite a bit and I found it comfortable very fast. The clip is set with torx screws making it more stable I think. They are overpiced imo but I love the idea and straps.

3. Official leather one:
Looks good, very stiff though. Guess that will loosen up with a bit of time as well (and already wearing it 2 hrs makes me notice it less). Wouldn't use this for sporting, but surely for day to day wear. Overpiced imo again, but got a discount as I had to wait so long for it and had a coupon so got it half price instead which is more the proper value.

Conclusion:
Official ones ARE more rugged/decent but are overpriced. Proper pricing would be ~30 for the sillicon ones and ~50 for the leather I'd say. The chinese ones offer great value for money and I have no problem whatsoever using them for general sporting and daily wear... Perhaps going deep-see diving and such you might want to reconsider ;)
If you have any questions, shoot!