I think the 51mm pro is a great upgrade to the original Epix (47mm IIRC). I probably wouldn't have upgraded if the original came in a 51mm. But the larger size makes things easier to read at a glance. The LED light, which at first thought of as more a gimmick is actually useful. I use it often when around the house when the wife is still sleeping, at the camp site because it's faster than pulling out a flashlight, and numerous other tasks that require a floody low power illumination. I purchased the DLC coated version along with the DLC Ti bracelet and they have both held up great. Both have been extremely scratch resistant despite use in many sports and activities ranging from outdoors, gym, and duty use. The AMOLED display is great and I get @11-14 days between charges with a constant-on setting/Zzz -mode starting at 2200hrs
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