I got one a week ago, I love it! I've been shooting 35mm for a long time and I'm loving the bigger film size! 6x7 slides look awesome.
Yes, it's a tank, I wouldn't take it backpacking through jungles or out on the street, I use mine for Portraits and landscape/nature shots, I always use a tripod and I always use the mirror lockup + cable release. You'll love the bellows focusing. I'd get another back for it it I were you, I only got one back and it's annoying when I want to shoot black and white and am halfway through a roll of slides.
If you came from 35mm like I did, medium + large format photography is great, you slow down and take your time, meter the exposure right, get focus, dof and composition right, more good shots per roll, you should always use a tripod and you can double/triple-check everything on the ground glass before you take the shot.
Enjoy your new toy!