Well built but too bulky,
1. Its Size - the Travelproof adaptor is the biggest travel adaptor I've used and therefore not as compact as I would like when travelling light. Its also quite heavy.
2. The adaptor doesnt fit snuggly into the power board or wall plug (for all adaptors). Not sure if its the one I have but there's always a sizeable gap between the wall and the adaptor and due to its size and weight there have been instances where it is not supplying electricity at all because it is hanging off the wall plug (thus requiring a firm push to put it back into place).
I probably would buy a different travel adaptor this time around.