Quoted:
Sir, since I'm not into bench rest shooting and don't load only a few cartridges at the range I wouldn't know from that perspective. However as an active highpower rifle competitor I do normally reload about 1000 rounds at a time. I've learned that consistancy with each and every cartridge in every step of the reloading process provides the results I'm looking for. Primer seating is one of those steps and I usually do it with reloading trays of 100 cases each while otherwise doing nothing in particular, ie: watching TV.
I've used other primer seating methods including the progressive stages of my Dillon 550 and 650 in addition to the original tube fed mechanism on my RCBS Rockchucker. I've also tried a few of the hand primers, Lee included and I've broken a few. Nothing compares to the tactile sensation achieved with the Sinclair tool, I can tell from the sensation when the primer is properly seated and that's the important part to ensure as consistant ignition as I possibly can given the manufacturing variables from the factory. JMHO, 7zero1.
The Sinclair (first picture) is a well built tool to be sure, with great feel as you say, but since you have to feed it one at a time, it's slow and tedious (best done with a distraction like TV as you said), with its square handle, it's not comfortable to use for long periods, it doesn't come with shellholder, and at $120 plus another $16 for a Lee Autoprime shell holder set ($136), it's hands down the most expensive hand tool. No other hand tool can touch it for a classy status symbol, though.
The Lee Autoprime (last picture) is designed as a thumb operated tool, which isn't nice to my old thumb during a long session, but it's the cheapest my far at $18.50 + $16 (shell holder kit)..that's $34.50. It won't last as long as the Sinclair, but you can prime tons faster, with excellent feel, and buy several years worth of replacement parts and still never approach the cost of the Sinclair.
Lee's Ergo Tool (the picture of the bright red tool) is way better designed for long sessions, with similar feel except you can rest your thumb since it's a finger pull tool. You can get it for $26 + $16 ($42)
The second and third pictures are the RCBS Universals, tray-fed, and APS strip fed. They are the original "Ergo" design, well built, no shell holders to buy or fiddle with. Comfortable with great feel seating primers. Tray fed is $52 with no shell holders to buy or fiddle with.
The APS version is pricier at $62 for the tool and a few strips, but then unless you already have one, add $36 for a strip loader . Total $96. Packages of extra strips can be purchased also if you need more. The APS is best for people like me who bought the RCBS Pro 2000. (strips, strip loader comes with that...and you are already buying primers already loaded in strips ($6 more per 1000). Worth it for me, for the convenience and speed. But even when loading special stuff on my single station press, I still like the APS tool best....I gave away my perfectly servicable Lee Autoprime.