[tekkk]

I wouldn't be worried unless they explicitly try to own intellectual rights to stuff you make outside your work. They are just trying to cover their asses with as many clauses as possible but really, only time I'd see them being enforced if you jump right into a competitor and/or create your own competing product.

[zugi]

True, most of these are pretty readable by a lay person, but there may be clauses and phrases in there with distinct legal meaning (e.g. "work for hire") that you might miss if you just review it yourself.

Though I'm not saying you need a lawyer. I've signed plenty of these agreements and never hired a lawyer. Just know you're taking a risk in doing so.