You could be a student or teacher of statistics, an academic on a budget, a budding researcher. Statmac Plus is worth your time to explore.
In the real world much data lives inside Excel (or can be exported to it -- especially if you have to work with M$ Access). If you do not want to export your data to other programmes for statistical analysis and would like to work within Excel, you should look at StatMac Plus.
Its only real competitor is XLSTAT which is good but expensive and has withdrawn support for next versions of Excel on the Mac (due to dropping of visual Basic functionality in Office 2008 by its inventors Microsoft).
So realistically StatMac is your only hope.
This does not deter the software from being very competent and increasingly fast and easy to use. The interface is quite simple but little awkward and requires some getting used to. The time investment is no greater than exporting Excel data to another programme.
All the usual options are there and work well. The developers are very responsive and have taken the programme to new performance levels with each update and have promised more.
For teachers of statistics and lone researchers StatMac is highly recommended. There are price options for those on a budget.