Great steppingstones to move into a different/better company. Talk with superintendents and maybe you can get hired on with them. If you’re professional and know a lot prove that to superintendents and managers.
Cons
Pay is low for preps. Raises are very rare. Don’t do more than what you’re required to do. You could miss better opportunities at other places.
Gives you the opportunity to make connections with builders and high-profile individuals in the industry which may lead (and often does) to better opportunities.
Cons
Pay could be a lot higher, gas reimbursement is only $10 per day unless you drive over 50 miles which isn't much, and the job sites are often far from home.