I tried the deployment buckle on my recently acquired 253 and it feels awful.
Seems like it's way too big and the sharp edges tend to dig into my skin.
I'm sure for some it's not a big deal but on a small 6.75" wrist it feels too big.
Also, the part that attaches to the long strap does not open and is hard to insert the strap.
I'm going back to a tang buckle it seems.