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I was wanting to lean towards MTS because they are a local company only about 20 miles from my house but after reading several reviews and stuff on here about them i might just have to go with a spikes lower.
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I had a couple out of spec lowers. They replaced them and it was all good from there.
I later bought 5 or 6 more for super cheap (like $50/each) and thought most were out of spec. There was actually a piece of metal on the buffer tube threads that was keeping the lower from being flush with the upper. I just ended up pushing the upper/lower together a bit harder and they were all good to go. Whenever I actually use the lowers, I'm sure the tiny piece of metal will wear down a bit and not cause any problems; for now, the upper and lowers fit tight.
I won't say they are the best machined lowers I've ever seen. There are numerous differentiating markings on most of them. However, the ones I've used have been good to go and their customer service was good. If you aren't building a lightweight gun, maybe consider spikes or PSA. If you're building lightweight or want a FDE cerekoted lower, then go with mag.