I haven't been on a K-Mod yet, but have been on the EZ Ryde and the latest Timbersled.
The EZ Ryde is an awesome skid, I have skids equipped with the standard Fox Zero Pro's which are very good out of the box and Exit equipped skids which just have to be ridden to grasp the level of performance they give.
I like the EZ ryde as it gets up on the snow quick and does not trench. It holds the nose down but still retains the playful nature of the sled. Big holes on the hill get eaten up by the skid, you just don't even notice them, on the trails the thing eats rollers, g outs, etc and spits smoothness out the back end. Its a dream to ride, so much so that after riding one my wife demanded her own..... she wasn't kidding. She told me I could have mine back when she had one, needless to say we own a few of them now...
The Timbersled is a very capable skid with fast adjustments, it just needs good shocks to really perform. We had 2 air shock equipped T-sleds in our group and while they held the nose down, ride quality wasn't there and they weren't on the level of the EZ Ryde. That changed with Timbersled offering the Exit shock package. I have 2 Exit equipped Timbersleds and have been extremely happy with them. The shocks really make the difference here, ride quality cant even be compared to the air shocks, it is that much better. The coupling adjustment is a nice feature, on my 727 I run about 10% coupling for tree riding as it allows the sled to be playful, I crank the coupler up to the 20-30% range when climbing using the nitrous, it keeps the nose down and the sled going forward.
Due to my past history with the Fox air shocks on the TImbersleds, I will not try them again. I know advancements have been made, but the Exit coil overs work to well to chance it.