I might be tempted to subscribe as a one-off now and again (such as when we away on holiday), but they've not proven that they can deliver a reasonable quality product (without folk walking in front of the camera or having other obstructions in the way, for instance) and there seems to be no guarantee at the moment of full matches being available.
£4 a month is sort of Ok (although why would you pay between October and January?). 8 months potentially, £32, discounted down to maybe £20 for the full 12 months? I'd probably go for that.