Jelmoli department store and Jelmoli mail order are two separately run companies.
I have ordered mattresses and bed frames from them - a few years back. Reliable service. Cheap delivery up to the front door (even if you live on the 4th floor without a lift). Quality was fine (they were brand products, so no surprises there) and prices very reasonable. I would certainly choose them over IKEA for the delivery service alone.
I occasionally order clothing and other things from them. So can recommend the Jelmoli mail order.
AFAIK there is no warehouse that you can go and visit. That's a disadvantage if you're looking for something in a particular colour or if you want to test-sleep/sit. But still, give them a call: customer service should know more than I do
Another online shop for furniture with free delivery and good service is
www.bader.ch - however, it's a little more on the "traditional" design side.