Fortunately, I have never had a bad experience with a deputy 
service. If you're looking for good ones, the only two I have 
dealt with recently (within the last two years) are Rinkya and 
Anime Chaos, both of which have been professional and 
extremely helpful.  Of course, like the previous poster said, 
everyone makes mistakes and we're only human, so no matter 
which service you go with there is always the risk something 
could go wrong. 

Best of luck!