My condolences for your loss!
The H&K VP9 is a very nice Pistol with a good reputation for feed reliability, accuracy, and for most, ergonomics. It's a far different Pistol than your Taurus PT92C and .45 Witness, but don't let that put you off of it.
A lot of times we get so used to the ergonomics of what we have had, that we have a hard time of adjusting to something new and very different.
Spend some more time with just the H&K VP9, and you'll probably adjust to it.
For myself, I know that when I've spent time in my carry rotation with one particular handgun, it can be hard to adjust to the next one.
Here''s a review of the H&K VP9:
Side note on the H&K VP9 is that it did not fare too well on the Youtube Military Arms Channel Mud and Water Tests, but then again, a lot of good pistols don't.