I actually don't quite mind them... affordable yet fashionable.. I don't have to worry abt maintaining them! I can drop it/bump it/scratch it without shedding a tear.. like my J12 that I broke....
I love that it's alot lighter than ceramic watches too!!
I have a white and a purple chrono plasteramic, here's a quick pic of my white one I'm wearing now:
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I get heaps of compliments about it, ppl keep asking if it's ceramic!
The jelly/rubber ones that they have do look cheapo but.. each to their own I guess!!!
Durability.. I bought the purple one in July last year.. and the white in November.. I wear them alot, as i think my rolex is too flashy for where I work and there are no visible scratches on it so far! The white's as bright as the day I bought it!
At the end of the day.. they're not meant to be "real" watches, as someone aptly called them... they're just meant to be fun... I guess that's why they named it.. "ToyWatch" !
I had been out clubbing and somehow managed to crack two of the links near the end piece... I did have a bruise on my wrist where the watch sits so I must've banged it hard against something 
Luckily I had extra links from mine and my sister's to just swap it over, didn't cost me a thing! *phew* my parents would've killed me!