Too many to cover in detail:
-Management in general (specifically North America sales management (toxic), global product management (incompetent) and the entire c-suite including the CEO, CFO and CMO). They exhibit a lack of focus and genuine appreciation for employees. Each has his/her own political agenda.
-Too many changing and conflicting priorities.
-HR does not serve the people; rather, HR serves only the agendas and needs of executive management. The HR business partners in the US can't be trusted.
-Talent development is non-existent. Promotions are politically motivated and based on favoritism.
-Benefits, specifically salaries, are below average. And there are deficits in the pay, treatment and opportunities afforded to women.
-Very little work-life balance if you want to be considered an employee that just meets expectations.
-Slow to innovate, slow to market.
-Recruitment process and treatment of job candidates is embarrassing (just ask anyone who has interviewed with Stratasys in the last year).
-Treatment of employees that leave the company is equally embarrassing and disappointing. Falsehoods and rumors are spread about employees who quit on their own. Exit interviews are inconsistent - you're lucky if you're given one, and if you are, don't expect anything to be done with your feedback (in other words, they aren't worth the time).
...There are many more cons not mentioned but in listing them all I'd be wasting more of my time than I care to. Also, as others have mentioned beware of the more recent positive reviews here. The company actually has a "strategy" to combat the negative Glassdoor reviews by having a few select, current employees submit overly positive reviews with exaggerations about how great the current state really is.