Personally, I'm not a fan of the NATO straps that I've tried on my 2201.50. Reason being that the PO is a thickish watch and most NATO straps on the market are quite thin. Perhaps the best strap I've ever bought was a black 22mm ZULU for my Seiko. This strap was purchased from a dive shop about seven years ago. Thickness-wise, it's almost as thick as the nylon straps that you find on messenger satchels. Perfect, IMHO. When I went back to this dive store to buy some more of them in a 20mm size, I was told that they were made by a guy interstate and A) he made them as a hobby(!) and B) he doesn't make them anymore.
I'm still on the hunt for a thicker-than-usual NATO strap and I'll find one, or die trying.
Anyway, enough chit-chat. Here are some pics;
SM300 (yes, it's not the PO, but the colouring is similar.) on a TrueBond strap that sold for less than half of what the CORVUS ones cost. A lot less than half.
Omega OEM rubber strap on the PO 2201.50.00
Real Bond ZULU on the SM300
Some cheap $40 leather strap with white stitching (to compliment the white hour markers) on the PO
The best of the NATO straps that I've found so far (eBay seller's name is gligs. No, I ain't related to him.). Photo given the Hollywood soft-focus treatment to make me look like an action hero...if action heroes weighed 126 lbs.
Fits nicely on the watch, but I wish it were thicker.
Regarding durability of these straps, I'd say buy a few of them and see how long they last. If they get dirty, throw them in the washing machine (I don't need to tell you to take the strap off the watch first, do I?) and they'll come out good as new. If the straps start to fray, burn the frayed edge with a cigarette lighter. If the end of the strap starts to fray, get two coins of similar width to the strap, sandwich the strap in between them, clamp it down with a clip, and burn, baby, burn the frayed strands off.