I bought the Flextail Tiny Bike Pump Pro about a month ago from REI and have been pretty happy with it. You just turn it on, change the pressure if you need to (it remembers your last pressure setting), push the valve right into it (stem facing down, it comes with an attachment tube but I don't bother with that), and press the button to pump. It shows the current pressure and shuts off automatically when it hits the desired pressure. It tops off my 32mm tires in around 5 sec to add 5 psi (running at 65 psi). I haven't tested/timed how long it takes to fill an empty tire. I ran it up to 100 psi from 60 psi just to see how long that would take and I think that was about 30 sec. It's replaced my manual pump, and I just charge it the same time I'm charging my bike lights. Since I'm always using it, I don't have to think about if it's charged or not. It's got a battery level indicator on it.
My only gripes about it are 1) it's not water resistant - a little ziploc back is included with the pump, and I keep it in that inside my saddle bag when riding, and 2) it's mostly made of plastic, so not sure how well it will hold up over time. I wouldn't want to accidentally drop it on the pavement from any distance (there's no impact-resistant cover on it).
But other than that I really like the convenience of it and speed that it pumps.
Hope this helps,
Tim