I think a lot of the problems folks had with LiPo were early on and a carry over from the r/c air guys.... Wrong type of charging and early cell technology. I have a couple of Orion (Kokam) packs.. a 3200 and 4800.. I love them.. but.. a good 4200 NiMh pack will have more peak and average voltage by quite a bit. Even with the weight differences a good NiMh will out perform the LiPo.
At our local track more than half the folks have at least some LiPo packs.. no one mishap.. but there are people popping NiMh all the time!
Integy.. well.. use email.. English isn't their primary language... lol.. I have been buying from them for at least 10 years..