I tried to like the glocks ...
when I picked my first centerfire. Had this big plan to own a g22c with a bbl for competitions, etc. Just couldn't fall in love with the ergonomics. Was going to do a grip reduction. Would have been illegal in some competitions, so I passed altogether. Went with the BHP.
A year passes and I decide I need a plastic pistol. Tried them all, bought a p99. I've traded out on a free glock certificate (love to say ... "they couldn't even give me one" hehehe).
Now, looking back, I wonder if I had gone with glock originally, I'd most likely have adapted to it, and learned to shoot it well (to my capability).
IMO, you can't beat the reliability of the glock, you can only try to match it. My p99 has nary a hiccup, but doesn't have 8 kazillion rounds experience like the glock family.
I am a safety officer for action pistol matches, so I see a lot of folks shoot a lot of diff guns. Bout the only think I've seen choke a glock was a limp wrist. This IS bad, but isn't likely to most shooters, none if they are experienced and healthy. I see a lot of folks claim they are going to ditch thier pistols (many diff types) when they fail in competition and go back to their Glocks.
I'm a tiny bit paranoid, and I do like the decock feature of the walther. I love the mag release, I use my trigger finger which keeps my hand in place and finger off the trigger
Guess it all depends on what you want out of this pistol. Could it be an eventual replacement for the G19? I think you'll find the pistol is up to the task.
If it were me, and I wanted a cheap test, I'd buy a local used model. (there are some on the market from when guys find that the p99 does NOT make them look like Bond hehehehe).
Shoot your 19 as a test, and save the target and thoughts on it.
Use the p99 for 500 rounds or more. Then do the same test with the p99.
Compare the results, and your gut feel. Like the glock? sell off the p99 for ~purchase price. Like the p99? keep it or trade it for a new one. Keep the Glock too, I don't know too many folks who liked a glock that were ever happy about selling it.