I think Hank would also need some convincing to use it over a good old reliable shuttle (using a propane/anti-propane reaction to power it). Boomhauer isn't worried, having seen others use it without distress. Bill doesn't even consider the possibility until after he's been using it for a while (but still has a meltdown, wondering if the better version of him was destroyed).

Hank ends up using though after Kahn taunts him about it, not wanting his generically engineered superhuman Laoatian neighbour to get one up on him.