GE and McKesson's market are hospital corporations. Our customers are small clinics and imaging centers. The minimum price to setup a DICOM compliant archive is about $25k and that is not counting required support personnel. We do it for $99/month, and we are about 10,000x more accessible than either of those companies for customer service and support.
I do worry about marketing, however. I am hoping this is where we can garnish advice from people like PG (et al). How do we penetrate a market that is so difficult to change? I've seen first hand health care facilities choose more expensive solutions that were inferior products.