Accuracy:  I tested this scale by lifting a set of dumbbells (15 pound, 20 pound, etc.).  The scale always gave a reading within half a pound of the rated weight of the dumbbell (up to 40 pounds, which is the heaviest weight I have).  That's greater accuracy than I expected.

Size:  The device is larger than I expected -- about the size of a pack of 4x6 index cards.  That's bigger than I care to carry, so I'll be using this device only to weigh my luggage before I go to the airport for the outbound leg, not carrying it with me to see how much weight my luggage has gained during the trip.

Ease of use:  I thought the strap would be trickier to use than a hook, but it only took a few tries to figure out the best technique to get an accurate measurement (for me, the best approach was to zero the scale, then buckle the strap around my suitcase handle, then lift).  You have to lift in one clean, smooth motion, almost like weight lifting.  Also, you must lift with one hand (I'm not sure why), so you won't be able to weigh a bag that's heavier than what you can lift one handed.

Price:  Excellent.  I got it via an Amazon Gold Box deal for ten bucks.  I'll make back that investment the first time I avoid an excess weight fee.  I went over the allowance on a trip overseas last year and it was incredibly expensive.

Overall:  Ease of use is not perfect (especially the requirement for one-handed use), and it's a bit big to take on a trip, but for weighing bags before a trip it's a low cost and highly accurate tool.  A good investment that will pay for itself quickly.