It really depends on what sort of racket you're used to using.
My own experience is from switching from an Armortec 800 Def to a MX80(3u) - I've found that my control and power has improved, however maneuverability wise I'm finding shots at or near the body a lot harder to clear due to the racket being heavier and more stiff
I'm using both of the rackets currently with the same string/tension setups (VS850 @27lbs) and my experience from using them in mens doubles/mixed games.
I find the the MX80 to be the more stiff/direct feeling of the two rackets, drives and smashes are easy and it still retains enough maneuverability to defend ok and play a good net game. definitely more head heavy than the 8DX. I can honestly say this is my favorite racket for driving, gives a very positive feeling playing these kinds of shots.
I find this racket to be stiff but not so much as the MX80 (despite the 'extra stiff' designation in the spec) drives are good but you have to work a bit more to generate power in your smashes compared the MX80. Net play and defense with this racket is great, feels very sharp and quick when you come forwards to play the net and make kills.
Both have strengths in particular areas and I switch between depending on how i feel/play.
Had very similar results with BG80 string but found it a little hard for the 8DX and my shoulder! YMMV