I've got three "decent/good" multitools.
Leatherman Squirt P4 - great for a small pocket thing.
Leatherman Kick - Nice multitool with a good set of screwdrivers.
Gerber something - Well the pliers work well and the knives are easy to flip out without opening the thing up (looking at you Kick).
I wouldn't put any in my car as a backup set of tools.
I actually have a multi-tool in every car but just as a backup, light duty tool. I don't need anything fancy. The biggest use for these things is pulling the nail out of a tire before I install a plug.* I agree with the other poster who suggested spending far less and just getting a few basic pliers, screw drivers etc. A cheap multi-tool isn't a bad thing to have but it seams silly to put a $100 tool in the car when that will buy quite a decent set of tools.
*If you want a great thing to keep in the car, a tire plug kick and a mini-compressor. With the pair I've been able to repair most of the flats I've had over the last 20 years. With the SUV I don't even have to take the tire off half the time.
Yeah I also keep a small 12V air compressor in my cars. I never have to fart around with finding a station that has air, and I can blow up balls, air mattresses, etc. with it.
The multi-tool arrived from Cripe. Definitely not bad for $2.50. It's about 3.5 to 4 inches when the pliers are in use, and the unit folds down to about 2.5 to 3 inches. The pouch seems well made, though the belt loop is only about 1.5 inches, so it may not fit on larger belts. But I guess you could connect it to a carabiner and hang it from a belt loop or get a larger pouch.
The tool itself also has a small clip independent of the pouch, so you can hang the tool itself from a ring of keys. As far as quality, it is definitely not HD but seems OK. It has a wire cutter built into the plier head, has a couple blades, a file, a bottle opener, small Phillips and slotted screwdrivers. Definitely worth the $2.50. In a pinch, it's better than nothing.