I've got to hold my hands up on this one - we have used them. The experience was really good, no hard sell at all only us prannying around deciding what pictures to purchase.
We ended up spending £1400

I think it's a bloomin (proper expleetive unprintable) ripoff, but the photo's are impressive (all fully framed) and it was as part of the wifes 40th Birthday present (and 41st, 42nd, 43rd......51st, 52nd

)
The kids enjoyed the experience as did we, but Venture definately do play on the heart-strings/guilt as regards to pricing of items. All the photos were very good, and it was difficult to decide what to buy, but as a few have already mentioned, could be done yourself i think easily.
Friends have also used them 2 or three times (usually when a new child has come along etc) and have spent a fair few pennies.
They must be either raking it in to be able to afford to advertise on telly now, or desparate for business as there are more and more people/companies now doing this type of thing for a lot less money.
wabbit - I love the first picture, that is awesome, exactly the format that venture do - nice
regards
Gary