I find it comfortable. Most of my Relic Hunting and a good percentage of my Coin Hunting takes place in very littered sites so I use smaller-size coils the most. In low-to-modest trash areas I like a mid-sized coil, and for open area searches, such as plowed fields, open woodland, large grassy parks or sports fields for example, I then mount a 'standard' size coil. With many makes and models I find a 'standard' coil, such as the 7X11 DD's used by Nokta and Makro, might or might not be fatiguing after a short hunt.
For example, on my Makro Racer 2 I keep a small 'OOR' or 5½" round DD mounted most of the time and opt for the 5½X10 in less trashy areas. But I find the 7X11 coils, early version, like of the Racer or similar to the mounting position and shape of the Impact, as well as the current offering which is similar to the Nokta FORS series, to feel a bit 'nose-heavy' and uncomfortable when I try using it for any average hunt time.
On the other hand, and I am comparing with many makes and models I have previously owned or used from Fisher, Garrett, Minelab, Teknetics, Tesoro, White's and others, I was won over [size=small](one of many reasons)[/size] by the very comfortable weight and balance of the Nokta FORS CoRe using the 7X11 DD coil. It is, by far, the most comfortable detector I used with a coil of that size, and that is duplicated by the FORS Gold + and my FORS Relic models.
Matter-of-fact, I used to use 'standard' and larger size coils very seldom partly due to the trashy sites I hunt but also because they are not comfortable. With my bad back and shoulder they wear me out in a hurry, but the FORS series are so well balanced and comfortable that I bought a couple extra Relic's [size=small](the unit I use the most as I spend a lot of time in dense iron trash)[/size]. That way I have a 5½" DD on one, a 5½X10 Concentric on another, and the 'standard' 7X11 DD on a 3rd Relic just for a quick-grab when I feel a need for a bigger coil in a more open area.
How a detector balances, feels and 'swings' for each of us can vary based upon how we adjust the rod length. Through many decades I have read many write-ups and descriptions about a proper coil positioning and long ago I came to agree with the method of having the search coil about 12"-18" in front of your toe. Too often I've watched folks with a long to very-long rod length extension so that the search coil is positioned way out in front of them. Their thinking, usually, is that they can make a broader sweep and cover more ground and, they imagine that that will let them get full coverage and find more targets.
The problems, however, are that quite often their sweep is too fast and that impairs efficiency. With such a wide sweep path there is too much arc in the sweep and a lot of area is missed. Their overlap techniques suffer greatly. Moving the arms for a fast, large sweep tends to make the feet move faster as well, so again, more area is missed and not searched. The weight transfer way out front also causes more imbalance and that equates to a heavy and unbalanced feel, which in turn also makes it uncomfortable and less efficient.
Those who use what I consider a 'proper' rod-length and coil position will have done what the operator can do for comfort, and the rest is up to the detector's weight, weight distribution, arm cup/hand grip/grip angle size and positioning, whether the control, display and battery housing(s) are located so as to be top-heavy or not.
Taking that into consideration, and after spending a fair amount of time with the Impact and standard 7X11 DD, I have found it to be very comfortable, better than most competitor's models, better than my Racer 2 w/7X11, and almost as comfortable and well balanced as my FORS series models. If I was not to mention other specific models and just was asked flat-out how it felt, balanced and swung, I would simply say: Quite good! It feels very comfortable in-the-hand and is well balanced, with the small 4X7 or standard 7X11 DD coils. And I can very comfortably swing the Impact and enjoy a good day afield.
Matter-of-fact, it is so comfortable with the stock 7X11 that I might even thin my arsenal and let one of my Relic's go. I have mainly relied on a Relic or CoRe when I wanted to use a 7X11 DD coil, but I believe the Impact is now taking over that chore. I'll still rely on the small elliptical for most of the very littered sites I hunt, but it is very pleasurable, for me, when working more open areas with the 7X11 DD coil.
Monte