Mechanic is an R&R mofo. He diagnosis nothing, he just slams stuff. Like a clutch is blown apart, he slams it out in 3 hours when it pays 12 hours.
Technicians diagnose things, like Datalink issues, wiring cluster-focks, etc. These guys have the brains to look at this stuff.
It does get to you after a while, expecially when somebody says, "I don't care how long you were in school and how hard you worked to pay for it. You're still just a grease monkey." Not true...I'd like to see them diagnose some of this stuff. There are engineers that thing if their gas gage breaks on full...they don't have to keep filling the car with gas.
SK has some good tools. Truthfully, if you are going into the Heavy field, I would pretty much bypass all chrome sockets and get mostly impact. You need a lot of 12 point impact stuff for the heavy guys, as they use the hell out of 12 point bolts, and the new MB diesels use 5 point torx bolts. Those specialty things you can only get at Snap-On. This has worked out great for me...you are not a pro yet. You earn your living off your tools...but why are you going to spend $7,000 or more on a box and tools when you are just starting off? One guy has been at my shop for years.....over 25 actually. He still has the Craftsman tools he started with.
My buddy at the shop bought his stuff through Snap-On...he is $7,000 in the hole owing $85 a week for his box and tools. That's hard to pay with all your living expenses and insurance and everything.
I'd suggest this (unless somebody else is paying this off for you.)
Buy a Snap-On box you like, since you can always change what is in it. Go to Sears, buy a Craftsman mechanic tool set. Buy one set of Metric and SAE impact sockets and call it a day. You ARE going to run into a time when you don't have a tool for something, or you need a specialty tool. When that comes up, buy from Snap-On.
You have to think, my Snap-On guy shows up once a week. Till he shows up...I still have a broken tool I can't use. If it's a Craftsman, the place is open 7 days a week so I can go get a new one on the way home.
SO...for your core, use just a good ol' Craftsman set. ANYTHING that you use very often in heavy circumstances (for me, one is a 5/8" impact swivel socket), which you'll find out when you start working, buy from Snap-On.
You don't want to be so much money in the whole on a starting wage....and still not have most the tools you need because you are buying the expensive stuff. Start small (except for the box so you buy one only once) and grow. Can't go full out when you are just starting...