I concur with Indyan; Onspeed is NOT just another internet accelerator, web enhancer or tweaking software- In fact, Onspeed tweaks nothing!
Onspeed is a software AND a service- the Onspeed proxy servers abroad provide data compression and caching, while the client software (which you have to install) will act as the local proxy on your computer which will enable you to recieve data through the Onspeed servers, plus provide local optimizations.
So although Onspeed doesn't
physically increase the speed of the internet connection, but by compressing data
before it is sent to you, you'll be surfing much faster since you are downloading lesser data. In short, your speed is
virtually increased.
Before Onspeed:
Website -> Data -> Internet -> Your PC
After Onspeed:
Website -> Onspeed Servers -> Compressed Data -> Internet -> Your PC
Of course, there IS a limitation: Onspeed wont affect regular downloads much- because most of us download files that are already compressed (like zip, rar or compressed exe setups, or maybe even audio/video, which is again, already compressed), hence there wont be any significant speed increase with these files.
Thus while Onspeed
does provide broadband-like speeds while browsing websites on normal dialup, it wont affect your regular downloads much.
If you still have questions, look here:
*www.onspeed.com/en/find_out_more.php
And the icing on the cake: Onspeed will also work on GPRS connections, AND in case you already have a broadband connection (with a download/data limit), then Onspeed will be actually saving you money (since you'll be downloading lesser data while browsing websites!)
As for the original question, whether Onspeed is safe and sound? Well of course there are always privacy issues when proxies and web-services are involved- but, personally, I've been using such services (Propel, Artera, Onspeed) since a long time now and have never myself faced any issue. (besides, in India, who cares about privacy issues anyways
)