I've got one of these and it's amazing
I was very tempted to get the old DSE-601 when TECC sold them but was put off by the maintenance cost (replacing the bowl when the atty went!)
The cartomisers are pretty long lasting and can be easily refilled. I actually like the flavour of the carts (but I vape mainly tobacco flavours anyway) and the battery is
the same as the one in the SD
For me, the most impressive feature is the auto-switch - it works incredibly well and helps make the experience of vaping the e-pipe to be very similar to that of smoking a tobacco pipe.
I have a lot of different devices (Tornado, SD MK II, Microlite and a couple from another manufacturer) and find I use them all depending on my mood: My e-pipe is for those times when I want to sit and chill out and just enjoy vaping - for that purpose, there's nothing that even comes close