Hi telnet
I have definitely had laptops send and receiving over large distances using the AP 175's. What you need to be wary of is hidden node issues that can affect large coverage areas when you have multiple devices connected at once.
Hidden node in case you are not familiar with it is when two devices that are on the wireless network can see the AP but they are not able to see each other. This can lead to data collisions and excessive retries which will impact on the wireless performance.
It just depends on what sort of bandwidth your clients are using on the wireless, if they are using fairly high bandwidth applications then you will more than likely see the effects of hidden node. If the clients are only using low bandwidth applications then the hidden node issue may only have minimal impact.
If you need any more info on that let me know.
Thanks.