Tecnet 3400u quality?

I recently purchased several tecnet 3400u radios and headsets for my rental inventory, and have a week or two to test before committing to the purchase,

The radios will primarily be for conventions and event use in Hotels and Convention Centers, and I will have a total of 12 radios initially, but might expand this to 18 or 24 units in the future.

The Tecnet product seem to be good quality construction and specs at a decent price, but does anyone have any experience with the 3400u?

Are these reliable, and do they perform as well as comparable Motorola radios?

Is this a good long-term investment, or should I stick with a Motorola or alternate manufacturer with comperable specs?

Any advice or feedback you can share is greatly appreciated!