I ride rollers a lot, and have ridden several different types.
Kreitlers are the best, without doubt. The alloy 3" ones are my favorite--they provide a bit of resistance and will last forever.
Most rollers are 4.5" in diameter, which is easier to ride and smoother than the smaller ones, but offers little resistance. If you just want them to smooth out your stroke, they're fine, but IMO the smaller ones are more versatile.
The plastic drum rollers that you'll find for less money are definitely not as nice as the 1UP, Kreitler, and the other Al ones. You're right that it seems like they are unjustifiably expensive, but that's the deal. The E-motion thing is cool. People have done home-made versions as well. I also suspect that it may not be quite as beneficial as fixed rollers. The reason you get smoother on rollers is that they magnify any imperfections in your riding, and allowing you to move fore-and-aft may reduce some of that effectiveness, but I'm speculating.
I'd say the thing to do is buy a cheap set on CL or something and ride them for a while. If you find them to be a vital part of your training regimen, go for nicer ones. But, a friend of mine is trying to unload some top-of-the-line Kreitlers right now, so if you're ready to pony up some more money, let me know.
ride bikes, climb, ski, travel, cook, work to fund former, repeat.
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