I recently upgraded my monopod to a Sirui SVM 165. It has a one hand operation for extending the legs, and it works great.
Things that I like:
One handed operation, twist and drop/extend.
Wide foldable tripod base. *)
Quick release for all parts: head, tripod base and extender.
All can be removed and are compatible for use as stand alone units or in combination.
The tripod base is larger than on Manfrotto so standing the binocular is possible (but not recommended).
I also got the 30cm extender for it for additional height.
Rarely needed - but it weighs very little so I usually have it on so that I have shorter travel for the extension to working height.
Also the extender can be used as a table tripod with the tripod base.
On top is a tilt/panoramic head which supports up to 3kg and has a counterspring that works great for the 12x50's. It is a Smallrig with arca swiss connection so the RRS bino attachment slips on easily.
*) They just released a 35cm tripod base which has a foot pedal for the ball head socket. I might get that, I have use for both.

