It is very resinous,usually REAL heavy with trichs when grown right.
Its pretty serious bud, that will kick your ass if youre not a regular smoker.
As far as i know its still pretty available in the UK, in clone only form...There are no seeds for the 'original' cheese..Cheese seeds are usually X's that have been created to make the strain more accessible to the masses, and are usually pretty weak in comparison to the real deal.
If you get the opportunity to smoke that stuff, DO IT!
If you can get a clone, go for it..You wont regret it.