I run a whiz wheel faster than even the electronic E6B, spin look, all there is to it.
Yeah, they're speedy for some stuff.
For most of my flying, 120 knots goes into 60 minutes so nicely that it's all just in my head. The airplane usually goes a tad faster but usually you're just double checking times, and a little slower number gives a fudge factor. And I have a knack for finding headwinds.
Doing winds on an E6B is a PITA in the cockpit. It's easier to do a mental guesstimate and pad it, or use the electronic gadget if you need a crosswind component down to a single degree. Which is rare.
I've done the "hold your thumb on the dot" thing when all I had was a pen that would have left a permanent mark, too... so it can be useable, but not particularly enjoyable. Sometimes it's just easier to eyeball it.
Pencil, dot, rotate, slide, for winds... all that silliness in flight? Not unless the other three gadgets all died simultaneously in a massive EMP pulse. Annoying.
I had one instructor who was in love with this thing...
http://www.stefanv.com/aviation/flight_computers/cr.jpg
Which is fine, except I had to go buy one and fart around with it to make him happy. The small ones will fit in a pocket easier and take up less space, so I get the draw over the E6B. The "stick your thumb on it" technique also works far better than on an E6B with a slider.
That same website has a write-up on how they differ, if anyone wants to read it...
http://www.stefanv.com/aviation/flight_computers.html
One of my co-owners nixed getting a digital clock when we replaced ours, because he was taught to use the clock face to estimate, as described about halfway down this thread here...
http://www.pprune.org/archive/index.php/t-471963.html
I've been trying it, and generally, it's close enough for government work.
He joked that if he forgets his watch, it's easier to visualize on a clock on the panel. I think he just wanted analog.
Fine by me, but I'd rather have an approach timer there in that hole. Or higher. Watching a sweep second hand sucks... but can be done... in a pinch.