One thing that would really concern me is Nu Star (or any company) controlling your chemical line - particularly with a touchfree machine. How many times have operators had to try a new line of presoaks etc. to accommodate for seasonal changes and/or specific geographic soil conditions.
I don't know how they work this, but if a manufacturer has a hand in this, I'll bet they have some private labeling deal themselves that they will want to use. Then, if things are not up to your specs, will they supply a more expensive chemical, or and additional chemical - if that is what it takes to get the job done? I don't know - just one thought that would have to be worked out before entering into a deal like this.
Also - Nu Star's distributor network is comparatively rather small - that fact alone seems like this would not be a feasible deal for many operators throughout the country.