Aftermarket Cruise Control

[Mighty Mira]

Has anyone installed one of these and actually been happy with it?

The reason I ask is that I paid a shop to install one once (that I had bought), and it worked badly.

Basically it would work ok on the level, but as soon as it began to climb a hill the cruise control would stop working.

The shop had said something about the car (a camry) not having enough vacuum to do the job right.

Any idea what had happened, any success stories with self installation on little cars, and any pointers to good commercial products?

Thanks in advance,
MM