One can get this bonus basically everywhere else in the area with similar sized companies. Hell, I got way more than that 8 years ago.
The vesting schedule is diabolical:
> 5% 1st yr, 15% 2nd yr, then 20% every 6 months
coupled with the turnover rate: http://www.slate.com/content/dam/slate/blogs/business_inside...
I can't imagine anyone rational and with reasonable technical skills thinking this is a good enough incentive to join the company.