I've got the porlex mini handgrinder, so I will just share my thoughts on it, maybe it will help you.
Just to set the context in which I bought mine.
My main reasons for buying a handgrinder were:
* I wanted a second espresso grinder, which was quiet, so to grind espresso early mornings or late evenings, without disturbing S.O, kids, or neighbours
* Having a small manual grinder to pack together with aeropress for coffee when on vacation, so I'd get my fix of fresh coffee
I'm satisfied with the porlex grinder as it meets both of my requirements, but there are a couple of buts:
1) Grinding for espresso, takes some determination, as it takes a bit of time and effort, but not hard and doable. I spend approx. 4 minutes to grind 18 grs for my double short.
2) Adjusting the grind is not that easy, since you are just adjusting the lower burr in or out
But in terms of grind quality it's certainly able to choke my Izzo Alex Duetto, so it grinds fine enough for espresso, furthermore I like, that it leaves no mess, since I can transfer my ground coffee directly into the PF as the container (the bottom half of the grinder) fits into the the PF easily. The grind seems nice and even, also on coarser grinds. The coarser the grind the quicker it is to grind (and less turns on the handle) is needed. I would say for aeropress or french press it takes less than 1 minute for grinding 18 grs of coffee, but as I only drink espresso or caps @ home, I've not used the porlex for that yet.
The assembly quality seems nice and sturdy. The footprint is small and it would fit nicely with an aeropress for vacation or the occasional hiking trip.
Would I buy it again giving the demands I was trying to meet: Yes, for sure.
But for everyday use, I stick with my SJ, as it's far more convenient
My 2 cents, but I am not entirely convinced, I answered your question
