Took me a couple days and a few different youtube videos to figure out how to install this properly. Definitely not a "drop in" install. That being said, the actual improvement to the feel and pull weight is amazing. It's really quite the difference. If you've shot one of the current shadow systems I'd compare the feel closely to that. In case it's not clear theres actually a few different spring setups included and once you've got the striker block and trigger bar installed I had no issues changing the springs to find a weight I like. Very satisfying reset aswell.
Overall I'd really recommend this to anyone with a M&P 2.0, but just be real patient and take your time with the install.