My first proper camera was a 1960's Praktica Nova with no meter, and as soon as I could I bought a Soviet (cheap) Leningrad 4 selenium meter, which perhaps wasn't very good, but was better than my teenage guesses. But since I simplified my camera holdings (in theory, to an F6 and a Hasselblad, although the 4x5 didn't sell, and I never offered the Olympus Pens or OMs), I have used a handheld meter an awful lot. Not with the F6, you understand, as part of the beauty of that camera is that it does things for me, and does them well. That includes its matrix metering, which has only very rarely made a mistake. But with many meterless 35mm, medium format and large format cameras along the way, I have gradually found myself not only comfortable with a handheld meter, but actually preferring it sometimes, even when the camera has its own internal meter. The meter I've settled on is a Polaris SPD100 which I bought simply as a corded flash meter for large format. But it does reflective and incident metering without flash, and also has the option of displaying EV which is good for the old Hasselblad lenses. It doesn't seem to be available anymore at B&H, so as a backup I have a Sekonic L-308XU, which is so similar I suspect Sekonic must have bought Polaris in order to market their version of the design. I only use it as an incident meter, flash or not, and it never seems to let me down. I compared it to a Gossen Digisix, an Adorama 1º spotmeter (Pentax clone) and a Sekonic L-758, and sold all of them as I found the Polaris was giving better exposures.
I've been having an extended fling with Olympus cameras lately, both half and full frame, and find myself choosing to use the OM-1 and OM-2n with the external meter just because - well, because of what? Because I can, because it feels like more control (which I know I can do with the internal meters by overriding them), and because I'm not photographing the kind of subjects that require lightning fast choices about exposure. But ultimately, it's because I find incident metering easier to get right than reflective metering plus adjustments based on the subject and the lighting. It looks harder and more complex, but it's actually a lazy and quick way to the desired result. Given that the OM-1 needs no battery except for the meter, and the OM-2n's need a pair of batteries just to make the shutter work, it won't be a surprise that the OM-1 is beginning to be picked up more often - I don't even need to remember to flick the switch on the top plate, and I have wasted film in the OM-2n's by forgetting to do that and assuming the manually set shutter and aperture would be correct. BTW, the original OM-1 is a great buy at present if you don't need the hot shoe connections of the OM-1n for the proprietary Olympus TTL flash - and who does? They all need a visit to Huntington, NY whatever the designation, so may as well not pay for things you don't need.
Does anyone else find themselves using a handheld meter even when their camera has a functional internal meter? If I'm just a throwback, a dinosaur or an atavist, I'm pretty sure there are others here to keep me company.