We've had quite an adventure with the R100. We installed two units on the opposite side of a mid-sized single story building during a complete renovation, both mounted on a pedestal approximately 6' from the double store front doors. Due to failed reads at the R100's, we had many return trips to the site, including a couple trips for on site meetings with the factory engineers. The factory insisted (at various levels) that these unit were all over Europe - no problems... We persisted and finally narrowed it down; with the doors open 4 or 5 inches and the hub in direct line of sight, it worked consistently. Whenever the doors were closed it was intermittent.
With is information, we questioned the customer and found that the new exterior window/door glass had been upgraded to Low-E glass which was the root of the cause for signal deflection.
The solution we found was to replace the hub antenna, installed a custom extended antenna wire (from an online source) the outside and completed it with a outdoor rated antenna. With this creative work-around they function most of the time but not absolutely consistently.
The long and short of this painful experience was that we could have saw cut the sidewalk, placed underground conduit and hardwired an HID card reader several times over. And it still would have been much cheaper and less frustrating than trying out highly the touted R100's!
A couple of years later now we are getting call backs from the same customer to replace the R100's, the batteries are rusting.
We use a number of Assa Abloy products. But as for the R100, let's just say, we are NOT fans...