Dan:
We have been evaluating all the major brands. Recently we have moved to the next step and installed a few Shockwatch Fleet Control Units to assess their performance. The reason we chose them is because they integrate with our onboard lift truck inventory control devices. No need for additional (driver obstructive) control units mounted on the trucks, no additional attennas or recievers etc. So far results look promising. Best of all the vehicle operators have become much safer almost over night!!!!
To conduct a true evaluation you need to know the costs associated with damaged caused by your fleet. Then after implementation the reduced costs will pay for such systems.