We're selling via House Network at the moment and have got as far as accepting an offer.
They actually do far more of the process than I realised when I was checking out online agents - really the only thing we have had to do ourselves is the viewings. They do all the negotiating etc for you. We paid the extra for a dedicated agent which has been good as you always speak to the same person.
They have been pretty efficient at everything so far, and their photos were good. You have more control over the photo selection and number of photos you choose to display than you do with a conventional agent, which I liked. The photographer was good and he helped me to stage the rooms. I've seen some photos on conventional agents' sites where the photographers haven't even bothered to ask the vendors to remove the washing from the radiators!
You can also more easily control how they describe your house as they submit their descriptive text to you for checking.
You can also monitor how many people are logging onto your page, and there's a page for feedback so you can see what the viewers have said about your house after they've seen it.
We did the package where the HIP was included - apparently it hasn't been completed yet so we haven't seen it, but the energy assessor has been round. The agent said it would just be forwarded to our buyers solicitors when it was complete.
I'd say it has worked really well for us so far and would recommend it as long as you don't mind doing your own viewings. Personally I prefer to do them anyway, you get to meet the buyers and chat to them about their position which we found useful when weighing up offers. They have to give this info to the agent as well, but you do get more detailed answers and a feel for what they are like to deal with when you chat to them directly. Of course this is what a good agent should do anyway, but some don't ime!
We're selling for around £350k, and were quoted fees of around £5.5k by conventional agents. House Network will end up costing us just under £1000 when vat and extras are added.
hth!