typing "crap" is to ease up the things.
When typing the following, it is the direct explanation, means the same as above, but is much longer:
* mechanical work: great
* finish/materials: not up to standard
* electrical/drive technology: crap
* price: way above what its worth
... therefore the one single word, meaning the same
focusing mechanism, optics ... depends on user.
my personal view: one time dealt with a good reflector - never again optic.
Optic has 2 main reasons: aspherical - very special use, and not much space for a large reflector (even then a good one easily kicks the optic, but such one is expensive and not mounted in production lights)
focusing mechanism - with I have to admit, I have not seen by now - adds unnecessary complexity and with focusing bulb lights, that is of no use --> why should it therefore be the bomb with led?
PS: none of both options so far.
Get a light driven with an 18650, something like Jetbeam Jet III Pro Ultra, ...