Spot on NoD,
The aircraft in question has no hourly costs, yup thats right you pay for only the fuel you burn and your landing fees. Great group model if you fly 100hrs per year in it as one member does (lots of free fuel from airshow attendance) and then split the bills equally come permit time. Not so good if like most you only manage 5-10hrs per year but are then landed with a share of £10k-£15k bill when something expensive goes pop....
As NoD points out fuel burn depends on how you fly but even on an average sortie I'd think £300 is an understatement.
Not a difficult aircraft to fly at all, I solo'd it in the minimum 5hrs, spent a couple of weeks studying the tech manaul and learning the systems etc but most of it was stuff I'd learned during my ATPL's so pretty straighforward.
Makes a lot of noise but the JP3 really isnt that exciting once you've got used to it, JP4/5 has considerably more grunt...
As for safety I'd look at the training sylabus you'll be undertaking and how well the aircraft is maintained...