I've been using a 601 as my primary at home vape for almost a month now (wow, that long?), so I have a few observations:
The pipe works best when you start with a VERY full cartridge, and let it squish down real good. The bridge in the atomizer is quite high, and will push down on the batting and wick a lot of liquid. Once the liquid movement starts, it seems to continue very well.
This also leads to it's primary design flaw- the atomizer is not sealed from the rest of the bowl, and both liquid and vapor seeps back up towards the battery and cap (which is also where you'll find a tiny notch on the stem side of the top of the bowl, this is the air intake). When liquid gets up there, the draw gets harder. This also happens when the atomizer gets flooded right after putting in a new cart. To combat this (probably a 50/50 flood likelihood otherwise), I puff like crazy for a couple of minutes right after replacing the cart. Carts seem to last 2-3 days or so for me, assuming I'm using my e-cig outside of the house during the day (at work). My first thing in the morning vape is the pipe, and all evening as soon as I get home from work.
Every few days/weeks (depending on use), or whenever you think you've got too much loose liquid in the bowl, you should take out the cart, puff it mostly dry, and then hang the bowl up to drain. I like to roll up a bit of paper towel and gently slide that into the stem, touching the wick, and another in the battery compartment. I thoroughly dry around the threads and wipe down the wood and hang the bowl over the rim of a glass, stem down, overnight.
Eventually, loose e-liquid will break down many components, I've heard of long term issues with the stem coming loose, but this doesn't seem common without some extra help (like vise-grip help!), but the threaded ring will come loose at the top of the bowl, and the wood is likely to develop small cracks. I suggest catching them early, and filling in the micro cracks with STRONG superglue, and gently prying out the ring (when it's ready) and resetting it with superglue the same way. Be careful of noting the top versus bottom, it fits better in one direction with the cap. Brands probably don't matter on superglue, but I used "Gorilla Glue" I picked up at target.
Again, be careful not to fill up your air channel at the top of the bowl.
I agree the included "marlbro" carts don't taste good- so I drained them with a syringe, put it into a mixing bottle, and doped it up with a mixture of my own e-liquids and lorann's, then cut it to my approximate desired nicotine strength (I just wanted to go somewhere low because I puff on the pipe all the time) with VG and thinned it back out with a few drops of vodka. All in all, it's probably just the barest shade thicker than the stock juice from the cartridges, and tastes loads better.
I found two main flavors work well to my tastebuds with the pipe- cherry, and my favorite "dark blend", which is basically coffee, chocolate, vanilla and cream (all dekang juices, cut with vg).
The pipe seems to cut flavor, but greatly enhances aroma, so I find myself puffing away, forcing more of the vapor into the back of my mouth and out my nostrils while I largely breathe normally. Within a few moments, I feel a strong rush of both flavor and nicotine hit, instead of the quick sharp notes that my e-cig provides.
Sorry for the stream of consciousness post, I just wanted to share some of my experiences, hopefully I've responded to a few of your more pressing questions.