I've no experience nor interest in using Joikuspot, but as for QT Mobilehotspot (!= mobilehotspot package!), it is working flawlessly - it seems, that all issues of original mobilehotspot have been fixed. For me, it's stable quality.

Not to mention many additional (optional) features like automatic USB networking and internet sharing, but it's quite off-topic here.

As for battery usage tests, I'll perform some as time permits

/Estel