I'm afraid I cannot give a comparison analysis with other products. In any case, some comments about the MC-36 (which I use)
- It is limited to Nikon models wiht the 10-pin connector, so I believe it will not work with the D70 or D600.
- it looks and feel as a quality product, but I would not say it is a heavy-duty device and the cable may get damaged if abused.
- it is a pain to lock the device in place (as with many accesories that use the 10-pin connector) and the orientation of the guide in the 10-pin connector is not consistent across Nikon cameras. I find it easier to point the camera upwards when mounting the remote.
When using unlimited frames, you may run out of batteries before memory, so you might consider an external power supply.
If it is feasible to shot tethered, I find the options given by softwares such as controlmynikon (the one I know, there might be others) vastly superior, and it will work with the D600 too (not sure about the D70)