More is just expensive.

Close are no longer a problem today. Autofocus, Bildstabilistator on, remote and off. I have found for me that there are situations where I need the distance to adjust finely. So searched the interenet and the cross slide of of XCSource (certainly not the producer) ordered.
Of course, no need to explain much of a cross slide. But that no product or manufacturer description was in neutral box, but has been surprised.
To compound slide itself.
It is made of metal. The rails are performed in trapezoidal and run smoothly. The fixing screws press a key and inhibit that. Are inhibiting means when "normal", as just such screws are operated, attracted to the displacement plane does not move even when tilted camera. Should anyone use the sled with a heavy 300, the usage purpose is missed. Since the moment the adjustment is carried out via a helical gear so large that can be moved via the inhibition with force. But you should not do better. The adjustment is sufficiently accurate for the hobby sector. The only drawback is the somewhat fiddly mounting the camera on the screw. However, considering price, material and function, which is justifiable.
Thus, a buy rating.