Have any of you guys considered that a ski over your head can TEACH you how to ski better...like eventually to turn it the way you want, you have to have better technique and eventually the ski gives that to you...
my experience:
I moved from CT to Reno at the tail end of '03-'04 with my only pair of skis being Atomic R9s...a nice light, snappy "mid-fat" (at the time) with good edge grip but by no means a high expert level ski. Well I blew out the edge on the R9s early in '04-'05 and in my stupidity at the time I thought I should replace them so I bought 180 Machete Souls cheap online. Those things were BURL and hard for me to ski (especially bumps) but I got good with them and I would occasionally switch off with a friend who had Axis Xs and coming from that burly ski to the Axis was like swinging a baseball bat with a doughnut on and then taking it off...I had a few "I feel like Johnny Moseley" moments in bumps on the K2s when I would switch to them...I skied all of '04-'05 with the Machetes and got Chubbs towards the end of that season and loved them in our big Sierra snow year...
....then at the beginning of last season I bought Legend Pros after stumbling on a deal online. Whoo boy those things felt slow to turn and heavy and hard to ski at first...but I put the time in and within a month I was RIPPING on them (and I sold my chubbs to VolantAddict

)....then I bought Big Daddys and man those kicked my arse at first something fierce...but I grew into those and began to rip on them...and when things got tracked and I would switch from the Big Daddys to the Legend Pros I felt INDESTRUCTIBLE...like I could do any turn as quick as I wanted and I could go as fast as I ever wanted...
...so in summary, I think if you are on the cusp...you're good but it's just a new ski with a new type of performance...buying up and having a ski kick the snot out of you and whip you into shape could be just what you need...
...I say this though not ever having had a lesson in my life and having no clue if I have bad habits or not (you guys are the experts with that)...and I totally agree if you are a low level skier, up buying too much will slow down your progress - that happened to me when I was 18 and bought 200cm K2 Extremes

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(sorry for the long post)