Over the years, I have seen friends and relatives projects encounter numerous setback occasioned by overbilling, abscornment after payment has been made partly or completely, poor workmanship , poor quality material. Most of these were by suppliers and contractors commissioned offline. When I deal with suppliers online, most people around me feels I am taking unnecessary risk. I have not been wrong yet except for my previous bad experience with Jumia.
I may be wrong hence my seeking your opinion as well.