For all of the reasons to follow:
1) Price. At $1000 plus free shipping (at the time) it was the best value in printer for what you get stock and what you can do with it later.
2) Delta. I wanted a delta because they are faster and simply cooler looking than others. They are harder to calibrate, but I'm doing this as a hobby.
3) Upgradability. You can do a thousand different little things to make this printer PERFECT. You can print with pretty much any material you want once you upgrade the stock hotend to an E3D or something all-metal.
4) Build Volume. I liked the 280mm X ~350mm+ volume. You can't get that in a printer that has such a low desk space requirement elsewhere.
5) Community. I rarely, if ever, have to go outside the SeeMeCNC Forums to get ANY sort of support needed. Everyone here is helpful and literally every mod that can be done and every problem that can be had with these printers has been meticulously documented.
6) Kit. I wanted to assemble my own printer so I knew the ins and outs of it and had something to be proud of when showing it to friends and family later. "It makes me feel like a big man" to be able to do this myself.
7) American made. I'm not a super-pro-American patriot-type person, I'll buy stuff from China if it works, but in the 3D printer realm I have seen so much crap being peddled by companies in China, Taiwan, etc. European and American printer brands are built VERY well and the European brands such as Ultimaker were out of my price range and simply not as good of a deal as the Rostock Max v2. I guess this could be considered more of a "Quality made" heading rather than "American made", but they're both synonomous for the most part right now.
8) Not cheap wood. The parts are made from the melamine boards, whatever that is (I still don't know, I suspect some sort of plastic sandwiching dense fiberboard?), and they hold up to humidity well. I live in Hawaii, so it was either metal or something else that held up well in humidity above 65%.
9) The instruction manual for the kit. Holy shit, it's even better now than even 2 months ago when I build mine!
Some things I would improve:
*Note: These things are easy enough for a person to do themselves, but would be nice to have included stock for those who are stretching their technical abilities with simply building the kit. There are a lot of smart engineer types on here, but not everyone is that inventive.
1) A STOCK ALL-METAL HOTEND. Screw that PEEK crap. Sorry, but for the quality of the printer I would happily pay another $50-75 to get a stock E3D v6 included sans the relatively crappy resistor-laden PEEK hotend.
2) Some ABS included. I ordered some, but it would be nice to have a pound of ABS included for people who don't know they need it for the PEEK fan. Although that can be solved with #1 above.
3) Better ventilation in the base. I would think an 80mm or 92mm fan on one of the side panels or venting out the bottom right behind the RAMBO would be sufficient, but with the bed at 90-100C the inside gets what I would call dangerously hot for the electronics. Even with 2 80mm fans, one push / one pull, I get temps up to 40C+ inside the bottom case. I am scared to think how hot it got before those things were on there! Also, maybe put some vents on the plexiglass panels to allow more airflow with the aforementioned fans.
4) A better method for spool holder. The stock spool holder is really annoying in that the spool keeps getting caught on the edge. Something rounded would be nice. Maybe just a length of PVC pipe to fit around that arm would be sufficient even.