Tried it, but I found that judging by a single picture whether my house is 'more' or 'less' is too limiting. I honestly tried to tweak it afterward to see if the valuation would make a bit more sense, but it didn't.
FYI I bought my house 415k 2 years ago, zoopla tells me it's now worth 550k, and 'getagent' first estimate was... >900k! After tweaking it was still 770k (!) - Mind you some rather shitty houses seems to have sold for quite a lot but still...