Filming Track

I've not used any of the cheap ebay sliders, but I've got a Hague travel slider & I find that to struggle getting a smooth slide with heavy cameras & lenses unless you support the weight. Some of the more expensive sliders have a pulley system so slides are much more consistent in speed. Try & get one with proper bearings not just nylon inserts.
 
As your asking for a dolly and not a slider, the answer should be very little.

The only main difference is in the bearings on the tripod casters.
 
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