Excellent bargain, mine must be around 7 years old now and never a problem.Just been to my Local Aldi. They are on clearance for 35 quid a go. It's no brainer really.
I also run a 25 litre compressor with my cut 40 the longest run I had is 13 minutes of cutting with the CNC cutter, the compressor just about kept up, the motor/pump was quite warm/hot at the end, as it has to keep up with the air flow, if you do manual cutting there is a better chance it would cope, but at them costs, no brainer if you dont have anything buy it.
One thing to consider is to get a better, bigger air line something like 3/8" or 10mm if you can even the 8mm internal would be better for the plasma then the 6mm supplied in one of the semi ridged plastic coils. Places like K-supplies or other similar places would do them at 10 metres or more for not a lot of money.
Adrian