I used 3 for a really awkward shower install. I just couldn't get the copper angle correct soldering. It was at least 5 years ago, no problems at all. Still not sure I'd bury them in a wall (I have access to 2/3 of them through a hatch, the 3rd I could get to if I really had to). I'd still much prefer to solder, but I think they have their uses. From everything I have read they are being used pretty extensively now. Whether that's a good thing or not I'm not sure. If mine ever let go it's just unfinished space below with a floor drain, so I felt OK using them there.
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