I have my fair share of 'gadgets', specialty rulers being my weakness. I usually try to us the item, at least once. Some stay and some gather dust.
I think that our impulse weakness, is when we see it demonstrated it looks so easy and in our mind .. 'oh, that will help me soo much!', but when we get it home and months later when we pull 'it' out to try ... we do not remember how 'they' said it works. So read through the instructions, play with it ... darn that doesn't look right ... read some more ... get interrupted ... back to reading, playing ... success .. then might use it again ... months/years later.
We are all impulse shoppers... why do you think they have all that candy at the check out counters.