USB Multi Charger for all your devices?

What Peter Says is correct. Cigarette sockets rely on the plug contact to be held in place by a spring and all sorts of problems with that occurr down the track. With the Merit connector, the plug contact slides into a proper socket. This makes a much better connection and tends to be self-cleaning by the action of the male contact sliding into the socket.

A little known fact is that 5V power supplied by the original USB connectors is only specified for use for low powered devices. Phones that can charge quickly and tablets are powered by voltages of up to 48V. This can not be supplied directly from a 12V cigarette socket. It requires some sort of inverter in the line. SCUBADOO has given a link to devices that do that, but I would not rely on these for long time use, as they plug into Cigarette lighter sockets. If you look at this link Power you will get a bit of a grasp on the subject of USB power.

If you can not find devices that can be connected directly to your battery through reliable connectors, then make up your own panels or boxes and cable them directly to the battery (and don't forget the fuse near the battery to protect the devices wiring.)

.
To add to Peter’s wisdoms…. Some accessories such as navigation aids often come with a cigar plug and integral power module which prevents changing from the cigar connection. So if you must use them then the plug tightness can often be improved by judicious bending of the side contacts out a little or by adding a turn or two of insulation tape to increase the plug diameter as has been suggested earlier.
The cigar plug is the descendant of the long gone auto cigarette lighters but we unfortunately seem to be stuck with it as it’s cheap and easy.

Garry L in a word NO as it relies on the cigarette plug and as I said most cigarette plugs supplied on vehicles are not designed for anything more than 20 seconds use to heat a cigarette lighter.
The positive pin on a cigarette lighter plug rarely makes any more than a few square mm of contact and so are prone to heating if higher currents are required for any length of time.

Peter

I don't have or use one but numerous friends do with similar products without issue.

They get away with it for a while but it is not a long term solution.

Agree with the others, a lot of cig outlets in cars these days are only rated for 10A or less, if you keep the draw below that you might be ok but you would be better off installing wired in chargers like these:

fast charge

Charger

For things like laptops then use a marine cig locking outlet or a merit type though I have still had issues with those and larger laptop chargers. You might find a small wired in inverter is the better option and use the AC power pack.