[jacquesm]

Raising investment is not typically a sign of technological excellence. It could be but it's certainly not a reliable indicator. Long term reliability of such systems can only be determined in the long term. So far the score does not look good for trackers.

[pinkyand]

I'm not sure it would take the long term to determine reliability: there are engineers who specialize in that,and there are software tools to simulate the reliability of a mechanical systems.

Whether this company did this or not is unknown, if they are offering this system on a per month basis, it makes sense they did some reasonable level of analysis of costs, because it would reduce their risk greatly.