I agree with PineMartin for the most part.
There is different sleds for different situations. For the average "weekend warrior" you don't need an expedition sized sled nor do you want one. As many people know I used a Jetsled Jr. for my pulk design and for the terrain and style of camping I do it works fantastic. It goes over downed trees, through deep snow, up hills and track along trails with no issues for the most part. Over the past two years of using mine I noticed that very much of the performance of the sled is affected by your pole design. The tighter (less slop) connections tend to allow it to track and even let you rotate your hips to steer your pulk while you maneuver through your terrain. The crossed poles also make a huge difference. On my last trip out we have 4 sleds with us, 3 of us had the traditional crossed poles and never really had any issues at all, the 4th we had to jerry-rig which ended up with his pole connected in the center of his belt. for the straight areas that was fine but on the trails the sled didn't track and we had to constantly help it to keep it out of tree wells and on the trail. This ended up making him use more energy than he should of had to.
Another thing to take note of is that after using a sled for a short while you will tend to tweak you hiking habits. Kinda like a trailer on your car if you just hook it up and forget its there you are bound to have trouble or end up in a world of hurt. In the same reference to cars, traction effect things as well. Just because the snow is packed and you don't sink doesn't mean you should toss your snowshoe and not use them. Kinda like walking on sand, if youf feet slip even a little you end up using far more energy. Even with the added weight on your feet, having traction makes you perform more efficiently.