I have tried all three sets, the TM i tried from my friend who has these they offer good forgiveness and are nice to hit. The Nike Slingshots i would advise you to buy from testing them out and from the opinion of people who use them. They are quite heavy headed and just dont compare to the TM or the Ping's. The Ping is very forgiving and i very nice club but if you are wanting to change to maybe a set of musclebacks when you get better then it mite be a goood idea to buy the TM because of the price and save your money for some nice titleists or mizunos
Because even tho the g10 maybe be a slightly better iron than the TM, the price is double. but its your choice hope this helps