Do you buy first or research, comparison shop and buy later?
When I used to shop, I'd walk by a deal thinking I'd have enough time to think about it, comparison shop, do some research on the item and come back later to purchase it on my own time and terms. I've found this doesn't work for most low/greatly-reduced priced or those almost-too-good-to-be-true items/deals. I now purchase first, research and return the item (as new, unopened) if it doesn't work out to be a good deal (or is something I realize later I just don't need/want).
Do you buy first, buy later (after research, comparing, etc) or do you do both (hoping you'll have enough time to get in on the deal)?
If you purchase first, did you make a good choice? Or did you return the items, sell them or hold onto them to gift/hoard later?