Lebombo is run by Sanparks. Other similar trails are run by private concessionaires such as 'Do Limpopo'
Both are quite pricey, as already noted. More on that below.
The one we went on in April last year was the Luvuvhu trail, which covered the Letaba Ranch and Makhuya park (both adjacent to the Kruger - on the Western side).
I have not done Lebombo, but have heard the one criticism being that it may at times feel like a trip in which you do border control on behalf of Kruger management. I.e. basically driving along the fence between the Kruger and Moz.
Generally, and this applied to the Luvuvhu trail as well, do not do this expecting good game viewing.
There is a certain degree of exclusivity you get from these trips, and adventure. But game is thin.
In part, it is because of poaching. E.g. I am convinced that there is a lot of hunting happening in Makhuya park. The little game we did see were very skittish. Akin to that of a hunting farm.
The concessionaires would not admit to this, but if you go to Google images and search of Makhuya park, you will see lots of trophy hunting images!
In the case iif Lebombo, I woudl expect the same. Or rather that the Moz side of the transfrontier park area would be more prone to general poaching. Not just Rhinos.
There are other options too. Some more adventurous and others more 4x4 technical.
The one I am keen on doing is the five river trip. Not done by Sanparks. It requires five difficult river crossings and technical terrain and cannot be done with a trailer.
Your camping gear needs to be very comprehensive to make it a fun trip. Else it may be tough on the kids.
If you go without a trailer, like me, it is also a physically exhausting endeavour. Packing up and getting everything on top of the roof to make the departure time... Departure time is set with a reason. You still want enough time at your destination before dusk. My preference would be a trip in which I can stay over an extra day at each destination point. But time is on no-one's' side.
In terms of price and value, 'Do Limpopo' is slightly cheaper than the San parks organised trips. But only marginally.
I do not think it is bad value. It is the only way you can get access to the areas you will get access too.
It does, however I think depend on what you want to get out of it.
For me it is about getting a unique experience of the bush that is otherwise not accessible. That makes is worthwhile.
We enjoyed the Luvuvhu trail, but I would also not do it again.
I would do similar trips though, but Lebombo is not the first on my list.
http://www.sanparks.co.za/parks/kruger/ ... otrail.php
http://www.dolimpopo.com/4x4-eco-trail/ ... -eco-trail
Whichever trail you are driving, make sure you have proper 4x4 insurance for your recovery - unless you are driving a Patrol of course (and not a hand grenade at that).