They are big, clumsy, dribbly, fun loving, coat shedding, mud trailling, comedians. Visit someone who has them and see if you can cope with the size, mess, drooling and clumsiness before deciding. If they decide to sit on you, you stay sat on! they are also very strong, so unless you are capable of holding a big, strong, lunging dog then maybe you should go for something smaller. They are really lovely if you can put up with the downside. They also need a fair bit of grooming if they are not to smell doggy. They are generally good with children, but of course can easily knock a small child over.
Can't understand why you don't want an opinion from a breeder or show person, surely they are the people who know the breed and would really be able to tell you what they are like. A responsible breeder would want you to know the pitfalls before getting one, and would not sell you one if you did not seem to appreciate being jumped all over by their 'pack'. Can you get to Discover Dogs at Earls Court on 11th/12th November? There will be several there and the owners will be more than willing to discuss the pros and cons.
Try www.champdogs.co.uk click on Guided Search, Working Group, Breeders and there will be breeders listed from all over the country.