the 503 Rans S6 is not a dazzling performer when two up but it is not as bad as some would have you think. My example is upgraded to 430Kg and at that weight it is OK. 430Kg equates to the aircraft, me (86Kg), my partner (won't tell you her weight for life expectancy reasons), full fuel, a few tools, 4lts 2 stoke oil, petrol can and funnel, life jackets plus minimal luggage.
A few weeks ago we flew to the Blois Microlight Fair and the 503 proved to be well up to the task, including dragging us out of a short grass strip on a hot day. We averaged about 70mph and 15ltr per hour for the whole trip.
For everyday jollying about it is cheap and cheerful, easy to maintain and easy to fly. I have just passed the 300 hours PIC in the aircraft and would recommend it to anyone on a budget.