Bought it on XBone just because I have a bunch of Professorland Fun Bucks sitting on their service that I'll likely never spend.
Played through the first area last night. It's absolutely worth getting. It's gorgeous, has great attention to detail and the run-n-gunny aspects of it (boss patterns, using different shots on different levels/enemies, etc.) are all totally serviceable.
At this point, it's challenging but I find that has more to do with not knowing the mechanics well enough than really any challenging boss patterns or tight squeezes. My only real complaint I have at this point is often times there not being a lot of real estate to maneuver in when there's a big boss on the screen which makes for a lot of unnecessary guessing. Unless it really ratchets it up later on, I suspect I'll enjoy getting S-Rank on as many things as I can.