plus point : if the woodland requires management to improve and increase biodiversity, grants are often available from the Forestry Commission. Although they only cover a theoretical 50% of the costs, much of the work can be done yourself - no receipts required - just evidence that the work has been done. This can then be put against work where you need to bring in professional help. The Forestry Commission are also very good at providing advice on what would benefit the woodland.
negative point : depending on where the woodland is, it might be protected either by a Tree Protection Order, or by its status an an SSSI or 'area of outstanding natural beauty' etc. This type of protection can limit the value you can extract from the wood in terms of 'products' - although the FC grant / felling licence overrides the effects of a TPO.
plus point : value = priceless. I bought my woodland without reference to sites like this, and at the time my main thought was to protect my house from unwanted activities in the woods immediately behind me. I paid £5,000 per acre for 5 acres, although there was a total of 50 acres for sale - in hindsight, I wish that I had bought more. When I'm standing in the woodland looking at bluebells, or watching the setting sun, or listening to the bird song, the nearest feeling I can compare is the first flush of teenage love - but it's every day!
negative point : it's hard work. Even felling a 'small' tree involves an awful lot of clearing up. The tree is down in minutes, but the brash can take the rest of the day.