Z Class fare opposed to miles

I rung up Silver helpline yesterday to try to book LHR-MCO next October from PE to UCS using miles. Needless to say these reward seats had already been allocated and what was available did not really suit my dates to travel.
What the lady suggested was to take advantage of some good Z class fares going at the moment and save my miles (I will then have enough for a return UCS to USA using miles alone).
The price was £1432 pp. including tax etc. for return Z to MCO as opposed to £1133 for PE seats (+ 40k miles)for the upgrade. For £300 extra it seemed a good deal to save miles, get dates I wanted and get full reward miles/tier points on a Z fare.
Seem good to you?
What the lady suggested was to take advantage of some good Z class fares going at the moment and save my miles (I will then have enough for a return UCS to USA using miles alone).
The price was £1432 pp. including tax etc. for return Z to MCO as opposed to £1133 for PE seats (+ 40k miles)for the upgrade. For £300 extra it seemed a good deal to save miles, get dates I wanted and get full reward miles/tier points on a Z fare.
Seem good to you?