The main differences I've noticed between cheap and expensive laser levels are visibility and accuracy. Cheaper ones tend not not be visible in daylight beyond 10 feet or so, and lose about 1/8" accuracy beyond that point as well.
You get what you pay for, typically. I've used a DeWalt to install 30'x28' rolling steel doors, and it's a lifesaver. A coworker uses his $50 Amazon special laser level and can't seem to install a residential garage door straight.