Seen this and bought one instore (B&Q craigavon) as I thought it was a bargain.
2500w nominal output, 2800w peak. ie would run most essentials in your house at the same time, eg fridge, freezer, oil heating, lights, computer etc (obviously not your cooker and possibly not your kettle)
110 & 230v @ 50Hz output
4 stroke petrol engine (runs on unleaded- no fuel mixing required)
15l tank, with up to 8 hours cont. runtime
3600 rpm (noisy no doubt)
2 year warranty
The 'rockworth' gen - ie the usual branded one they sell is £259 for the same wattage