I have not, but pricing out a magwell, a threaded barrel, and that trigger (with installation from Walther), leaves me feeling like this is a decent deal. Especially if the street price is less that what is advertised on the Walther Arms website.
I got one ordered two days ago. Had "email me" on all the sites on gun.deals. KYGUNCO was the first to have them, then they quickly didn't have them. A few more sites came up and then they too ran out fast. Got mine ordered from Hinterlandsoutfitters.com just before they ran out. x Lastly, went to NRA convention last weekend and the rep said it will be June when they hit. While there I checked out the PRO and the trigger is THE TITS and is well worth the upcharge alone for the PRO. Get signed up and act fast and good luck!
Just picked up an SD Pro at a gun show and also saw one on my local shop/range. Got the mounting plate in only a few days and already have a Trijicon mounted and sighted in all within a week. I love the trigger! The Magwell is also nice as it's not overtly too big. Now I just need to try to find some more magazines with the extended base plate or extension for the 18 round mags.