This seems a great price for a mower of this spec. Original price of £399 seems a bit high, but there's very little out there in this price bracket for this spec.
Most importantly, this is a mulching mower, so should not be confused with a regular collection/ejection mower.
53cm cutting blade ideal for larger gardens.
Briggs and Stratton 190cc engine should be reliable and powerful enough to be up to the job.