The point of going McCruise is that it's supposed to be plug&play simple.
It's just expensive! $800! If you have to have someone else install either system for you, ya gotta pay...
A Rostra is much cheaper, but requires more work. They'll run ya between $250-300. It takes me around 10 hrs. labor to install one on a C14. The first one I did took me a weekend... mostly because I didn't have a good understanding of the system, how it works, and what it takes to make it work.
I had to get my hands dirty, roll up my sleeves, and learn by doing.
I've installed 8 Rostras, and serviced 3. (Damages caused by offroading, etc. Never problems with the Rostra itself.) I've also installed an Audiovox CCS-100. It worked perfectly for 2 years, too... then quit.
Turned out to be a defective servo circuit board, and was caused by the bike owner taking his bike to a mechanic for engine work, and the guy decided (for some stupid reason) to move and rewire the cruise's brake relay. When he did, he wired it wrong, and when the brakes were applied, it shorted out the servo's CB. Replaced servo, rewired the relay properly... back in business again.
Installing a Rostra system does take time, ability, some skill, and some tools.
But, it is possible for the average shade tree mechanic to do successfully.
I have no idea where you are located, I'm in Tulsa.
Happy to help if you're nearby, or I have my own electrical schematic I can send you to add with BDF's download instructions.
I've helped a lot of folks get their's going, and I'm here if you decide to tackle it and have questions.
Just let me know.
Good luck, whichever way you go.
Bob