Helion & Co. have gotten a fair few dollars of my hobby budget over the years. Interesting subjects, well presented by knowledgeable authors and printed on top-quality paper made their line-up of books one of my go-to for new or unusual periods. Of late I have been collecting their Century of the Soldier series.
I had a problem with recent purchase and sent an email about correcting the problem. The staff at Helion solved the issue and sent an email the very next day. How refreshing it is to have a company that understands what customer service is supposed to be like. So, Hooray for Helion! They have made a regular customer into a happy proponent of their services. Take a look at their site, they publish a wide array of books covering the 15th Century to the present and pay special attention to areas outside the mainstream.