I run a double rack of these little guys from 00-4 and they're my favorite small cams. A) They're the cheapest by a wide margin (which is great for the dirtbags out there) B) Metolius customer service ROCKS if you need them repaired, reslung, or cleaned C) They're durable. I've weighted, whipped, and aided on all of mine and they're no worse for wear. The only thing is the little plastic trigger connector things seem to wear out the fastest and only Metolius can fix them (see above) D) Great range, size overlap, and "stick" factor. I find the little range finder nice, but it isn't a critical thing for me. And these seem to stick better than other small.cams (save for Totems and Aliens). E) These things are friggen' light! With CAMP Nano 22s, these are some.of the lightest cams on the market. My only gripe is they get kinda floppy in the bigger sizes. The 5 and 6 are a bit floppy, but not any moreso than other small cams so it isn't a deal-breaker for me. The 7 and 8 are even floppier, so I prefer Camalots or Friends for those sizes (but unless you're using Utralight Camalots, the weight difference may persuade you towards the mastercams) I have aided on them and the lack of a thumb loop has yet to bother me or prevent me from making a move, but others may feel differently. For an aid-heavy rack, I'd probably look at other cams. For free climbing, the lack of a thumb loop has NEVER bothered me, but that's mostly personal preference.
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