Feedback on Lensmaster RH-1, RH-2 or Wimberley SideKick Gimbals

To all, like everyone else with a new longer telephoto lens I am considering buying some kind of gimbal. While I know the Wimberley is suppost to be best in class I came upon the Lensmaster products in the UK based on the recommendation of another POTN member.

I plan to use it with a Canon EF 300mm f/2.8L IS Mark I with either a 1.4x or a 2.0x teleconverter on a 1D Mark IV or 5D Mark III with BG-E11 grip. The tripod would be a Gitzo GT2531 (unless someone thinks that's not stable enough and I should move to a Series 3)

The reviews they post and the prices they offer are very compelling but before I pull the trigger I was wondering if anyone else has experience with either of these. I think I will pick one of these or the Wimberley Sidekick. Of course if you have experience with the Sidekick with a Markins Q-10 ball head please let me know as well.

Here are links to the Lensmaster and Wimberley products I am considering for fairness.

http://www.lensmaster.​co.uk/

http://www.tripodhead.​com/products/sidekick-main.cfm

Let me know your thoughts and thanks in advance.

I've used gimbals with 500s before - both Sidekick style and full gimbal - and am currently using a Sidekick with my Sigma 120-300 on a Vanguard ball head. For the 300 range super tele, I am comfortable with a Sidekick and would recommend it as a lower cost/lower weight option.

However, anything bigger gets a full gimbal as I am not a fan of side mounting 8+ lb lenses.

As for the tripod, I have read great things about the 2531 and I think it would suffice for your needs.