I purchased the Innorel RT75C tripod last year and have been extremely pleased with the results. I use it with a gripped Nikon D800E and a Sigma 500mm f4 lens (not a lightweight piece of glass) and am quite happy to carry it from hide to hide with the lens mounted on a hybrid gimbal head. If I intend walking any great distance I use the detachable monopod which alone provides great stability. The tripod itself is rock solid with the 500mm f4 on it and the only problem that I've had was my error in accidentally spinning one of the rubber feet loose without realising it and it fell off somewhere in Norfolk's wetlands. A quick message to Innorel resulted in a new set of feet, spikes and Allen keys arriving from China just 4 days after they had mailed them. Innorel staff have also been very quick to respond to any query and I cannot recommend them , or their products highly enough. Thank you Innorel.Update: My RT75C tripod is certainly the best tripod I have ever owned and provides an ultra-stable platform to shoot from. I recently asked Innorel Customer Support about the availability of a second centre column to avoid having to swap my ball head and gimbal head and for the price of the shipping it was with me a week later. Truly outstanding after-sales service - thank you again Innorel.