If a factory reset by pressing the recessed button with a pin doesn't work, the hub is bricked.
Yep, if you have your own router. Get an Huawei HG612 in preference to ECI, don't pay a premium for an unlocked one, it is unneccessary but they are trivial to unlock to obtain line stats if you wish to.
I don't think either are particularly fault prone, just the Huawei is simple to unlock, the ECI isn't. If you are not worried aout unlocking it doesn't really matter which you go for.