Our stay at this Hilton Garden was very positive, starting with check-in. We accidentally got there way before check-in time, but the guy at the front-desk happily checked us in. The room itself was very clean and looked very nice. The pool was also quite clean and enjoyable. The location of this hotel is also very nice. You are within walking distance of many shops and restaurants and are within a 15 minute drive of pretty much anywhere you'd need to go in Sioux Falls.
My only complaint with this hotel is the beds. Our bed was still fairly comfortable, but the "adjustable" part of the bed simply did not work. You could change that dial all you want, but the bed would remain the same. Other than that, our stay was very nice and I would recommend this Hilton Garden to anyone staying in Sioux Falls.