To be fair, I should have checked the watch's height, which is 17 mm, 2 mm thicker than my Casio G-shock.  I'm not a large man and the watch was simply too high on my wrist.  I did run through the operations, and it's very simple to operate.  I've had good experiences with Ironman watches in the past and have ordered a 100m WR model (13 mm height) which should fit better.

This type of watch can't be worn with a long sleeved shirt, but of course it's not the kind for that purpose.  If you don't mind the bulk of the T5F821, I recommend it.  I'm returning the watch for a refund, but as stated above am ordering a more appropriate model.