love my zero trem. its very stable.
the only thing i did was convert the bar to a schallar tremelo bar. i couldnt stand another pull out bar after all the crap i went through with my jem.
id say after that conversion its my 2nd favorite tremelo ive ever played since i started playing guitar as an instrument.
my only problem is disasembling it to clean it properly and having to do the modification above, but other than that i would only take a gotoh trem over one.