We used ours mainly to test the wireless. Wireless could be several different things so the preconfigured tests on this device allowed us to quickly eliminate certain areas and allowed us to focus on the real problem. It’s easy enough a PC Technician could use it.
The sourceForge speed test would be well suited in most scenarios. From simply measuring your speed when connecting to new networks to trying to diagnose network issues at your house, workplace or any other environment where you may have spotty internet connection. I'd say is not well suited to get perfectly accurate results if needed for any type of network monitoring.
We briefly tested a NetAlly LSPRNTR-300 LinkSprinter 300 Network Tester with WIFI and Distance to Cable Fault Indication and it was a worthy testing unit it but we quickly discovered that it did not offer the large range of testing in both the copper and fiber network drops, nor was it as complete with regard to wireless testing. But in it's defense it was not quite as pricy as the Fluke.
The main reason why we selected the SourceForge speed test at my job was due the company's heavy and aggressive website whitelisting. The sourceForge speed test was one of the few tests we tried that was able to work fine within our restricted network. Plus it was easy to ready, even to my boss.