I have to say both Matth3w and hookbill both have great points. I am one of the people who downloaded this app the day after it came out and probably wouldn't have rooted my phone without it, not because I didn't want to type a bunch of commands or spend the time researching what I was doing, to the contrary I spent a lot of time on this forum researching how to root my phone, I probably read Matth3w's guides 20 times each before I decided to root. The only thing that kept me from rooting was the shear number of posts where people thought they bricked their phone or had all kinds of problems after the fact. When the app came out, I thought this seem's idiot proof, so I read hacku's sticky about five times, and jumped in. It took fifteen minutes to root and install the ROM, and I had a one-year old crawling on me at the time. No problems with the install at all. As simple as it was there were still pages of people who had massive problems doing it.
If people would just do a little research they would save themselves a lot of problems. Some of the comments for the app on the market really make you shake your head. One guy wrote "what is this root thing and will it mess up my phone?" Are you frickin' kidding me??!! I think this is the type of person Matth3w is referring to. Your right if you don't know what it does don't do it. (The same reason I didn't install dropbear or openVPN, I read about each, still didn't know what they did or how they would benefit me so I didn't install them.)
I agree with hookbill that this is the easiest way to root your phone and it takes away the fear some of us had about rooting, but in my opinion you get what you deserve, and if you screw up your phone you (probably) deserve it. It is sad to see how many people come running here after they have problems. Luckily everyone still pitches in and helps them out instead of leaving them to blow in the wind, and that is really the best thing about this forum.
BTW rooting my phone, installing a custom ROM and overclocking to a conservative 800 MHz (on demand) was the best decision I ever made. It really was like getting a new phone!