The most common surprise on a house built around 2002 isn't the opener, it's what's upstream of it. If the home has had a door panel swap or an insulation retrofit since it was built, the door can be heavier than the original opener was rated for, and the new unit needs to be sized to the door that's actually hanging there now, not the one the house shipped with. We also see wiring that was run for an older opener's control scheme and doesn't match a current unit's terminal layout - workable, but it adds time. And with the service area's household income running higher than the regional average, we get more requests for smart-opener models with camera integration and app control, which is a fine upgrade but it means a stronger home Wi-Fi signal at the garage than some detached garages actually have. None of that is a reason to skip the job. It's a reason the quote can shift once we're looking at the actual door and wiring, not just the model number on the opener you had in mind.