Coming from using the same 2x Pioneer CDJ 800 MK2's purchased in 2008 and a mint Pioneer DJM 450 (2017), I must say... This unit blows my DJM 450 AND those old (But still beloved) CDJ 800 MK2's OUT OF THE WATER!!!The overall build is real solid. Heavy and feels professional, sturdy and the furthest from cheap. A mix of thick, high quality plastic and brushed aluminum on the jog wheel platters and completely encompassing each jog wheel section.The mixer sounds, feels and performs better than the DJM 450! The 450 is already an incredible, high performance $699 mixer as is! The DDJ 800's mixer is FAR SUPERIOR in my opinion of DJing for 15 years. Many more FX, Faders and even the CF feels so much better, without the Magvel! You can adjust SO MUCH in Rekordbox's menus. You can even change the color FX preset buttons! Rekordbox lets you deeply customize this thing!The jog wheels aren't mechanical, but honestly feel BETTER to me than the CDJ 800 MK2's and up do, IMHO. The jog adjust knob is really nice and lets you choose between a lighter, more floaty jog.. or a firm, very professional quality/feeling one.. The play/cue buttons feel better than on a new pair of CDJ's, no joke! The tops of the jogs are very high quality brushed aluminum that feel almost like glass, like silk.. Going from mechanical to reactive wheels took little time to get used to.. The 800's jogs are tight and on point! I am very surprised on how tight and firm the jogs are at 12 O'clock or even on the lightest setting. Very nice all around!The performance pads are insanely and deeply customizeable. I can't even begin to get into how deep they get. Between the hot cue/FX/beat jump and everything.. it'll take quite awhile to customize this unit to your exact liking.. But it was worth it when I finally got it just right.Rekordbox isn't too bad at all. A simple program that lets me access thousands of tracks acquired over the years at the simple turn/click of a dial.Overall, being an old school DJ learning on vinyl, mastering on CDJ's and now with this incredible piece of equipment, I couldn't be happier. It takes a veteran DJ awhile to go from discs to a program, but I'm on my PC all day anyway. I have been using Mixxx for many years now as a tool to test tracks at different bpm's and test before burning to CD, so if you have any familiarity to any of the other DJ software out there, then I'd say you'd be like me and pick it up moderately easy.I HIGHLY recommend this and I was lucky to get one at $775 (Before Tax) before the promotion from Pioneer was over on 12/31. (If you're wondering why you're seeing them at $899 now.) I would STILL get one even at $899!!!You seriously cannot beat the performance and quality for the price. This thing is AMAZING! It feels so solid and I couldn't be happier with how much more my mixing capabilities and parameters have increased!Also, I'm retired from paying gigs, but this thing rocked a house party it's 2nd night out of the box and is perfect for home use too! Unless you HAVE to have mechanical jogs, 4 channels and barely anything else of significance, then I would give you my 100% recommendation to just buy the DDJ 800 first, ask/think about things after..