I have never used them to be honest but I am more of a cash player anyway. However, I really think tools such as those are always worth looking at. Not sure if you have to pay much for them but if SNGs are your bread and butter any tool has to be looked into.
I used a personal trainer - can't remember his name but it was a brilliant use of $200 of my bankroll. I used to send him play logs for evey 1000 hands I played and he ran it through some kind of simulator to identify my strengths and weaknesses. It helped me eliminate my greatest weakness (playing too many hands from the SB out of position) and made me so much more profitable.
I've never understood the attraction of bestiality but looking back over my life it does appear as though I married a cow, lived with a moose, been out with at least 5 dogs and spent a lot of time being chased by whales.