I never had any problems with the Mega Manager (no spyware virus or ad-ware).. I don't know if there are some problems with the uninstallation, though since i never tried to remove the program from my pc..
what I can say is, that when I dl from MU the Manager boosts my speed by approximately 40 - 60 %.. when I download with firefox I get around 300 - 800 kb/s max. (with MUManager -> 500 -1200 kb/s max) .. I've used the MUM for about a year now and have never experienced any bugs or trojan attacks..
PS: I have a free account at MU..
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