The OP is a lovely watch but, even so, imo the 36mm Explorer wins hands down. There is nothing I would change. On the other hand, Rolex have beefed up the lugs on the modern OPs - it's only slight but the result is a watch shape that has become more rectangular, a little less elegant and with a less natural progression to the bracelet. To my eye, the Exp is also the most flexible watch Rolex has produced, the arabic numerals and absence of the crown at 12 make it sporty but, at the time time, it works perfectly in more formal situations. What a berk I was to sell mine ...