I have a TC 24D with the 60" RD MMM and am not that happy with it's performance in damp, moderately thick grass. Previously, I mowed with a Kubota BX 2200 w/ a 60" side-discharge MMM. The Kubota handled the damp, thick grass much, much better. If the grass is absolutely dry, the NH deck is fine. I specifically asked the dealer about the rear discharge deck's ability to handle thick, damp grass and was assured it would be "no problem". My dealer doesn't know it yet, but tomorrow morning he is going to order me the side-discharge deck and swap it for me at no cost. Hope this helps