They must be P28s since Marc says the 8 comes with 2800 mah batteries (p26 is 2600mah). I'm getting around 5 bowls per charge. But it's hard to say, I haven't gotten into a routine of how I like to use this thing yet... still experimenting with temps and technique.
Don't know if it's better than a TM, since I don't have one. I don't think it's better than my SplinterZ with a Vigreux stem by Phineas. I think the FW8 colors the taste of the herb at bit. There's a similar "flavor" in the 7. Not sure if its the wood or ceramic that adds that.
Capsules are integral to the device as others have already mentioned. The heater chamber has a sort of funnel of spiraled wire that the capsules drop into. If you put weed in the directly you'd have a bunch of charing and probably combustion. It can be a bit difficult to get them out and to get them in. You may have to turn upside down and take to get the capsule out. The good news is you can just blow into the stem to eject the weed first, if you're outside. If you turn it upside down and blow into there's a risk that the capsule will fall out ... so don't turn it upside down over a toilet or outside a moving car window. To get them in, you drop them onto the spiraled heater wire funnel. But most of the time for me, it doesn't drop in smoothly so I have to fidget with it a bit.
Is it easy to fill the capsule? Yes, pretty much just like this
how to fill a Ghost MV1 crucible ... from Sneaky Pete. However you can leave it lightly packed with about .1g or press down and get maybe .25 in there if you like. The hybrid heating system will work well either way. However once the capsule are hot, watch out, they stay hot for quite a while in the insulated chamber.
On the positive side it roasts very evenly, even at high temps. It produces similar vapor to a Ghost, but it's stays decent way beyond the first draw. You can clear a bowl on high temps in about 2 draws. But the internal cooling is not as good as the Ghost's heatsink, so I need external cooling (glass) when going over 400, unless I take 3-4 second draws.