for about £42 a rim they are not too bad, however, like many rims at this price and cheaper, the join is often a bit dodgy. They are arc-welded so no issues with strength, more alignment is the problem. There are good ones and bad ones. A good eye can detect most problems before even building them up, but sometimes the quality of the rim shows itself during the final truing stages, and if it's not so good, it can (and does) lead to very uneven spoke tension around the join area leading to a wheel that needs regular attention. Some open pro rims are very well made and build into very nice wheels. If you buy online then it's pot luck what you'll get.