Over the last few years, LightSpeed has developed a decent client base. Over the last few months I was able to visit some specialty retailers using LightSpeed (sporting goods store, candle store, and a boutique).
It was interesting that none of them actually bought LightSpeed specifically as they wanted something that ran on Mac computers. One bought LightSpeed since it had an open interface for add-ons related to automated purchasing. The other two owners bought LightSpeed as they felt both the software and the hardware had a cleaner and more updated look than the Windows-based point of sale systems that they looked at.
It appears that LightSpeed has mixed to mostly positive reviews (tough to tell which reviews are real and which are fake). You can read more here: http://www.softwareadvice.com/retail/lightspeed-profile/#reviews
LightSpeed has also worked to grow a local dealer/reseller base which helps when it comes to local support. You can find more information about LightSpeed by visiting: http://www.lightspeedretail.com/
From what store owners have told me, LightSpeed is a viable option for smaller specialty retail stores - regardless of whether you prefer Mac's over PC's. Keep in mind that Mac's do operate somewhat differently from PC's so if your computer experience is all Microsoft Windows based, you may need to devote some time to learning the Macintosh Operating System.
Are you in the US and in need of no cost retail point of sale advice? I'm happy to help and can be reached on my cell at 208-340-5632 (mountain time) or via email at email@example.com.