Theyve been around for a while and provide stats to the industry.
Most notably their results are used by
ISPA to help identify the best UK ISPs. The ISPA awards are probably considered the most reputable of the awards for an ISP to win.
Overview of technical testing:
Epitiro will test and monitor broadband connections using the isposure™ application
I've installed it in the past and ran it for a few months, but removed it a while ago since the logging feature didnt seem to be working properly and I couldnt always get to see the stats... yet I knew it was running the tests.
I think it may possibly have been a bug with the sys tray icon. That may or may not have been fixed now.
Something else that you may or may not be aware of is if you use the thinkbroadband meter, that includes the isposure software.
http://www.thinkbroadband.com/tbbmeter/faq.html#80------
Its not a keylogger, but it does provide information about your connection to other parties.