Internal sliding or folding doors

[Solitude]

Stuck a large extension to the rear and now want to be able to isolate the existing back room for heat and privacy purposes.
Have a gap of around 2.5m (approx 8' in old money) to fill up.

Thought about bi-fold, but have seen a sliding system recently with frosted glass (gives me the light transfer and privacy too).
What have you got and does it work well or would you change ???

[Rags]

Bizarrely just got off the phone from ordering a set of doors from Savoy Doors. I have juat ordered an 8ft set which are bi fold. Decent price as well!