Not a plumber. Did swap out some elbows on 1/2" steel water supply with some unions, couplings, and threading what I cut out. But I noticed there were compression fittings like this on sale at the big box. It would have saved me some threading work, but I was reluctant to veer away from threads and teflon worried that they wouldn't last. Is there a consensus on these sorts of fittings by plumbers? Are these things rated for long-term repair, and should I just skip cutting threads into the pipe next time and use them?
They are sometimes called "repair couplings" or "Dresser couplings" and can be useful, although widely regarded as suitable only for a temporary quick fix. Probably not up to any plumbing code for new installations. If pipe is not restrained on both ends, it can be forced out of the coupling. No doubt they have saved somebody's bacon many times. Nothing "gimmicky" about that!