I've tried the following Nozzle sizes:
Clogged way way too easily. When it wasn't clogged produced beautiful results. But in my experience wasn't worth the effort required to maintain it.
Tinkerine's 3D printers use these out of the box, and I've got quite a bit of runtime on a Ditto Pro+ with one. They seem to be just as reliable as a .4 in terms of clogging. Resolution is notably finer, all in all as long as you aren't mostly printing big things it's a better choice than .4 in my opinion.
The Standard..it's serviceable small enough to get decent resolution and big enough that you can stick a pintip into the nozzle tip to help clear a clog.
Notably less resolution than a .4mm nozzle but when you are printing big things it's so much after, I've run these with .42mm Z layers for very quick prints..
*Note I used 1.77mm filament for everything but the .5mm nozzle which was 3mm filament. I think you could probably find a happy medium between .25 and .35 where you'd get really high res results without the clogs but I haven't gotten around to testing it.