[gbanger]

I dont think Telemetry is a "must have" item for anyone apart from the guys that do FPV.
You don't need to know how high you are, that just comes with experience.
Where you are in the sky is as you see it, so all the telemetry on the planet wont improve your flying skill, It will help you refine it, but it is more a want than a need item.
Initial flights with new aircraft are predetermined by doing the maths on the ground with static amp tests and the like. (Remember you aircraft draws more current sitting still than it does moving through the air)
You always do a maiden flight with a new aircraft for a shorter period than you would expect from the battery.
Battery testing after each flight helps you determine exactly how long your flight time should be and then you just adjust your time in the sky on battery conditon at the end of the flight.
Drop by the field and we can explain it to you in detail.
But unless you have a shit load of money and like adding unnecessary weight to your planes, to access information that really dosen't make much difference at all, then I suggest you leave it until you really want it.
Gazz