This device has its merits for sure.
I can give plenty of examples. Users of tablets, smart phones, etc. that are not "jailbroken" or "rooted" won't get ads.
PCs running Adblock may not be allowed to view content where the programmer of the site has adblock detection. This would not work for this. I know because my HTC One is rooted and I have an adblock hosts file. When I tether any device connected does not get ads AND the sites that normally ask to turn off your adblocker are NOT affected. Videos at the beginning of Youtube and other news sites are also missing.
I don't believe it's necessary to buy a piece of hardware for $130 to do this, however. A decent SOHO router should be able to handle this task internally with some clever firmware hacks.
If not, a piece of router software like untangle or MikroTik should have this capability.
I don't know how powerful the appliance is, if it could handle the load of say a workgroup of 50 pcs, if it could SOHO users may find it useful to prevent driveby attacks. Users that listen to the radio, for example, often have a player that will display ads. If their machine has a vulnerability like out of data java, flash, etc. and gets hit with "WinSecurity 2013" or whatever fakealert shit, it's a PIA for the user and generates a nuisance call for the IT monkey.
Some could abuse it too, if you call it that, and use services such as Pandora and not worry about ads. However I believe these are injected into the sound stream now due to adblock in browsers.
I would not mind ads if they behaved and were static pictures. The ones that play sounds, jump all around the page like an earwig in heat, shit like that, are just the reason why everything here gets blocked. Nevermind the malware. Noscript FTW.
