Hi Molly, most main dealers will carry out some sort of health check every time they have a car in, there are various reasons for this, to make sure it is safe to use, to quote you for any work that is required and to avoid any legal responsibility if you drive away in a dangerous car.
Ask in advance if the check is free, if it's free you may as well have it done, it may highlight a problem you aren't aware of. Remember you are not obliged to have any work done, don't feel embarrassed to ask questions or decline any qoutes or to go elsewhere for a 2nd opinion, local smaller garages are usually cheaper than franchised main dealers as they have lower overheads and usually use cheaper "copy" parts not made by honda, although most will get genuine Honda parts of you ask but they'll be dearer than copy parts.
In the past I've found Honda dealers to be honest and responsible but a bit pricey, if they quote for expensive work it is definitely worth getting a 2nd opinion elsewhere to give you an informed choice.
Hope this helps.
Mick