I know a fair bit about Mattracks and track-conversion systems in general - I have a strong interest in the subject, including financially.
Mattracks cost about $25-$55K per set, depending on which models you want. Some of them are plumbed into your power-steering system to provide power some hydraulic rams inside the track assemblies, which raise the heel and toe of the track a bit when you are turning - makes it easier to turn. IMO, that's a huge increase in complexity, weight, expense to solve a problem that hardly exists, but I can see why they offer the option.
Track conversions are absolutely superb in a very limited range of conditions - soft ground without severe obstacles. As soon as you get out of those conditions, they start to fare very poorly when compared to tyres. Even in those conditions, they still compare poorly to dedicated tracked vehicles in terms of performance.
Their strength is in the versatility that they add to an existing fleet of trucks. If you are a utility company doing, say, powerline maintenance, with a whole lot of differently configured trucks (mobile workshops, cherry pickers, augers, etc). you can pick out the vehicle you need for a specific job, and if there is a waterlogged field you need to work in, or some environmentally sensitive ground, or snow, or whatever, you can fit a set of tracks, on-site, and get to work.
They are most certainly not go-anywhere items! They rapidly become a liability when out of their element, and then it's time to put the wheels back on.