Earlier quoted context omitted.
Horrible. I bought a 2010 iMac with a 5400 HD and a MacBook Pro with an SSD at the same time. The iMac became unusable long before the MacBook Pro because of its spinning drive. In fact, the laptop is still usable.
It's not an easy upgrade, but you could swap it out for an SSD. Checkout OWC (macsales) and/or iFixit for guides.
That 5400 rpm hard drive was a bad mistake.