I can tell you that I get a consistent throat hit, good vapor, and it's been very reliable. As for the cart performance, I never had really used one. When I use to use my M401, I never used a cart on that as well, I just dripped.
I will try one out tonight, and let you know the results. I know the 801/201 carts are huge, and I can tell you now that you will not get anywhere close to the 8hrs with a Sidesho cart.
You have the trade offs going with a smaller model like the Sidesho compared to the 801/201. The battery is a 100mah smaller than the 801, so you are not going to get the same amount of hrs, but having the included PCC makes up for it in a big way. The size, and style of the Sidesho makes it move convenient over the 801/201.
You can obviously tell from looking at it that you are not going to get the battery time & cart performance from the 801/201. You will get a reliable PV that gets a good throat hit, good vapor, and a PCC that solves many of those issues of it being smaller.
As for the carts it really depends on the user, as they slowly deteriorate from refilling. Again, I don't use any inner carts, so I can't answer that for you.