I've personally used Galletto on several cars (HDi's and PDs) without any issue at all! MPPS on the other hand, had it's first failure yesterday...considering I've only used it 3 or 4 times thats not a great hit rate in my experience. 
I also find Galletto easier to use and don't remember any setup issues either (that said I did install it nearly 4 years ago the first time).
I know you've obviously got a lot more experience in this field and maybe over a wider range there are more 'bad' Galletto's, but as I say I've not had a single issue with mine, used at least 15 times now, well double if you count reading maps as well.
I also find Galletto easier to use and don't remember any setup issues either (that said I did install it nearly 4 years ago the first time).
I know you've obviously got a lot more experience in this field and maybe over a wider range there are more 'bad' Galletto's, but as I say I've not had a single issue with mine, used at least 15 times now, well double if you count reading maps as well.