It causes the sled to be a little tippier and takes a little time to adjust to it. Other than that I've had no problems. Love it in powder, which we don't get much of out here. Went out to Crows pass twice last year and sure noticed the difference and would suggest it if you do more mountain riding than flat trail.
I think you will have to take it right out. It will increase inside ski lift but if you are not in a hurry on the trails is fine. I don't know anyone that left it in.