I have a Korg tuner, a Boss tuner and a tuner is just about every digital box I connect up to my guitar - seems everyone and their brother tosses in a tuner into their hardware these days. The Korg and Boss, I've had for years and do just fine...
The thing about stringed instruments is that they can be a little touchy when it comes to tuning compared to some.
When you first pluck the string, you actually stretch it out and at it's peak oscillation, it is swinging so far side-to-side that the string actually changes its tension ever so slightly and becomes a little sharp. Then it settles in to a steady note/vibration and will be a little flatter than when you first pluck...
So, given that - you want a tuner that moves slow or at least has a "slow" mode so that the needle isn't swinging back and forth. I presume since this thing you mentioned is designed for strings, it should already...
Next nice thing to have is a tuner that will play/emit the note you select (i.e. play it through a speaker). It's good to get used to tuning by hear to hear the beat frequency between two sources (tuner and your string, or two of your strings) when they are out of tune...
Your ear can do a better job of telling you when you are in tune than a bouncing needle (or digital indicator). Most eventually reach a point where they just need one note to get started from an outside source and then they can tune the rest of the guitar by ear in one of several methods...
Eventually you find out that "perfectly in tune" doesn't exist and you have to tweak it a little after the little box tells you everything is in tune you may have to go back and "fix it" depending on what you are playing...
All of this is a long winded way of saying that provided it at least doesn't lie to you about a given note's frequency, doesn't eat expensive batteries and is easy/intuitive to use - its plenty good enough and don't worry about it...
I tune with whatever gadget is most easily accessible at the time...