With two cats and the recent addition of a puppy, we've spent a lot of time here. As busy as they are, we never have any problem getting in (usually with 24 hours notice).
The staff are all very friendly and helpful, explaining everything. Every time we've gone they've called a couple days afterward to make sure the medicine we got is working out okay.
The prices are also very reasonable. I would definitely suggest checking out their website before booking your appointment, as they have weekly specials on there (http://www.oasisanimalclinic.com). And there's a PetSmart right next door to boot!