I've been using the Telepath for 10 months now on weekly gigs in venues and stages of various sizes and have found it to be very reliable.
I previously had a 2.4GHz system which gave the odd problem in some venues, especially hotels for some reason but the Telepath has been 100% reliable so far with zero drop outs. I also wanted something quick and handy that didn't use a powered floor receiver. I'm currently doing 3 x 2 hour gigs (with soundcheck and a bit of noodling) before recharging but I'd probably squeeze a 4th gig out of them if needed. Also using it for acoustic guitar gigs. While they are plastic, the units feel like they are of a decent build quality.
Finally, it's not a big thing but for the price and because the product is 2 separate units I think Fender could have included a hard-shell case to house the units and cable together. That said a small case is cheap and easy to source. Anyway, buy with confidence.