Not important at all if you don't care about whether you end up at a community or university program. Based purely off of my experience and the experience of some of my friends from this year and last year, you'll still get a handful of your regional university program invites without research experience and a score in the 230s/240s. If you want more university programs on your rank list that's when research experiences and/or higher board scores will start becoming important. It also seemed to depend on where your school is and where your hometown is. Being in the northeast is nice, as is being in the midwest. I'm not sure about other places just cus I haven't interacted with many DO applicants from other parts of the country.