I have a Motive power bleeder and it works well.

Things to look out for before using:

Make sure that the level sensor caps are in good shape and not loose or cracked. I have Girling on my '89 W124 and they don't last long before they are cracked and need to be replaced. Maybe the ones that I've been getting from the Dealer are old stock?

Check the cap seal that comes with the bleeder. Mine changed shape after a few years and turned into an oval. I use a seal from a spare OE cap and now it seals properly.

Fill the reservoir up to the maximum level before hooking up the bleeder making sure that the rear chamber is full as well. I put a mirror in the back so you can monitor the level in the rear chamber. On some reservoirs it is hard to tell if the rear is full.

It would be nice if a quick disconnect would have been used in the design of the bleeder. Also a schrader valve on the container would make bleeding off of the pressure easier.