Although I've never gotten a trike via the net, I can tell you our local dealer, Angletech,
www.cycledifferent.com Has sold and shipped 100's of trikes from it's brick and mortor store here in Colorado Springs, CO. They carry several brands and have excellent customer service, JMHO.
Angletech-Cycledifferent I've also heard good things about Utah Trikes, FYI.