Gecko Adventure Tour Company??

My husband and I (early 30's and fairly active) are planning a 3-4 week trip to East Africa in the fall. Part of it we are doing on our own, and part of it we are planning on doing with a tour group. We are looking at a tour offered by Gecko Adventure Tours because it does not just visit the game parks, but also has what seems to be a good cultural component to the tour (staying a night @ an orphanage, visit to schools, etc.).

Has anyone had any experiences with Gecko, either positive or otherwise? We are aware that it will be somewhat of a 'roughing it' experience camping, and are fine with that, but are more interested in what the guides are like, etc.

Thanks for any help!