Well, pulling out has a lot to do with the cage gap and the ring size. if the ring or gap is to big then you can pull out with relative ease. if its to tight you're looking at potential circulation problems. Most people fall into the 45mm area for their rings. A lot of people go for 50mm because of how foreign the feeling is of having something so snug is. But that leads to pulls outs and accidentally slipping out.
As for metal devices being easy to clean. They are, so long as the metal is stainless steel or of generally good quality like 316 or 316L. Hygienically speaking, it really comes down to how open the design is. The more enclosed the device is, the more moisture can get trapped. Makes for some serious funk and softens the tissue, which can lead to some pretty nasty abrasions. Which is why most people with more enclosed devices take them off for cleaning.
But if you're only going to go a day or two at a time, you should be fine with virtually any device. Just keep q-tips on hand. its super convenient to be able to dry inside the cage while out and about rather than getting a bit suck in there and ending up with a wet spot on the front of your pants, drawing attention to the unusually larger than normal bulge.
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