We're just back from 3 weeks in Uganda, two of them spent touring with Nature Link Safaris. There hasn't been a review of this organization in some time, so we thought we'd put in a plug for them.
We chose Nature Link in part because Joseph Koluo's replies to our emails showed that he understood what we wanted from our tour, and he did a good job setting an itinerary at the pace we preferred. A professor at Kent State who has brought college students to Uganda for field study gave Nature Link a glowing review, and we also liked the fact that they are Ugandan-owned.
The two of us toured 5 of the national parks and were very happy with the entire experience. Morris Masereka was our driver/guide/naturalist/mechanic/philosopher. He previously worked for ten years as a UWA ranger and guide, mostly at QENP, and he seemed to know everybody connected with the parks and tourism on a first name basis. He really loves observing nature and helping his clients to see what there is to be seen. He's about 85-90% accurate on bird identification from a moving vehicle, and that's without binos. He knows all the back roads and good viewing sites and when animals are likely to be there. He also took us to two eateries not on our itinerary so we could dine on local foods like matoke, goat stew, posho, dodo, etc. He just made the entire tour a thoroughly enriching experience for us.
The tour we received was essentially what we had asked for, and the only surprises were pleasant ones. The price was in line with what other operators had quoted, and possibly less than what friends have paid for a group tour elsewhere in East Africa. The big advantage of travelling privately rather than in a group is that you can set your own schedule as the situation and your mood dictates; to us it seemed much more satisfying and relaxing that way. And a big advantage of touring in Uganda is that you're generally able to enjoy the moment alone and not surrounded by hordes of other tourists.
In summary, we recommend Nature Link Safaris enthusiastically.