I personally consider the 1/4" set to be the crown jewel of the SK line, that 1/4" ratchet is a gem, and their sockets are built "Ford Tough" (or insert your favorite brand). The SK ratchet has a tooth count that's "fine enough" yet it's coarse enough to be just brute strong. Still, the Snap On is a better ratchet in pretty much every conceivable way, but then you're going to spend a lot more. So the SK set is a VERY high quality set with not the best ratchet, but a damn decent ratchet. As for SK's sockets, I personally haven't found anyone's sockets to be better. They're my favorite because from what I've seen, and my personal experience, no one's sockets are significantly stronger, but many are more expensive.
I would immediately subsidize that set with a long handle flex head ratchet, and M A N Y extensions. Get what you can afford, if you can afford the Snap On then that's a no brainer; just get it! If you can't, the Harbor Freight/Pittsburgh Pro is a damn decent knock off of the Snap On and they're dirt cheap. If you want to stick with SK, then they make a very good flex handle ratchet as well.
Now on to extensions - This is the life blood of the 1/4" because you often choose the 1/4" because it can get into the nooks and crannies. Get the widest variety that you can afford, with 18-24" on the long side, and a couple inches on the short side. Make sure you have swivel adapters and some wobbly head extensions are just damn handy; wish I had more of those.