Bottom line: SRM works reliably day in and day out. The power meter works, the head unit works. I never even think about the SRM; I can just assume it will work, instantly and with a very, very long battery life.
You get what you pay for.
Lower-cost alternative head units like the Garmin Edge 500 (Garbage Edge 500?) have proven to be unreliable dreck rife with problems (and stupidly moronic design). At a fraction of the cost of the SRM, I still feel I’ve wasted my money on Garmin. The SRM power meter and head unit are expensive, but a far superior value.