Not at all easy or "intuitive" to use, at least not to a non-accountant. Registration process is broken meaning the payroll software is currently useless (support call with Sage is outstanding). UI is very quirky to say the least and all in all, a well thought-out spreadsheet would do pretty much as well as this does.
If this is one of the leading products I seriously would not want to go near the competition!
HMRC offer a free payroll caluclator on their web site which is infinitely better than sage for single-employee companies, and MS Excel does almost everything else with a little patience.