The most useful thing about using this programme as I can easily track all my customer's sales without going in person to their shop! With Maxma you don't have go around town checking up whether they're still buying or giving out vouchers which would be very time consuming if it was that often needed too do so!! You could also set reminders into your account with maxima of how much each reminder costs before its sent off e.g., sending 10 text message remindys at £1 per one will cost alot more than say 100 SMS remindsies @£0pence/per send but only needs done once - worth every penny i think.
Have found no negative elements yet although some companies are sometimes slow responding even though we've been paying them money by way through paypal etc.. Just use patience :) Good solution if u need something easy & cheap then definitely try. Tracking what customers buy where helps us keep stock levels low meaning less wastage during busy periods.