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I've received a couple of hits from them. I've been watching them for a while because they intercept web traffic in a manner similar to phorm and nebuad, in this case subverting 404 responses.
If your site returns a 404 then ISPs that use this company respond by sending the visitor a page of affilliate junk. They are used by at least one UK ISP and some of its customers are ranting. There are also reports that they breach some web sites' T&C policies (they certainly breach mine). They also trigger firewalls on users' computers so are obviously interacting with the users.
I have so far trapped two IPs from the range below. I'm not sure what they are actually doing on the site. They couldn't be confirming a 404 because they hit a valid home page but I suppose they could be trying to assess what adverts to show on the substitute 404 page.
IP: 92.242.128.0 - 92.242.159.255
UA: blank, ditto all headers
Robots: no
Hit: single (home) page