If you want to print quadcopter frames, particularly ones larger than 200mm x 200mm then you want to stay away from the makerbot replicater 2x, which has a long narrow build plate. It may also only print in PLA plastic, which is heavier than ABS. Solidoodle is also smaller than the TAZ. If you are looking for alternatives to the TAZ, I’d probably also recommend looking at the Mendelmax 2, one of the Ultimaker designs, or if budget is an issue, a mendelmax 1.5 / AO-10x type frame.
As for the Pros for the Taz 4, I will admit to some bias, but I also think it is one of the better designs out there at the moment. It is entirely open source. You yourself can print any spare parts you want for the cost of materials. The part files are available so you can modify the printer at will. The frame is solid, it prints 300mm x 300mm, it does so accurately and repeatably. There is a working dual extruder design that performs very well. There is also a fairly active forum community and modification community here who like to tinker with and alter the printers to hopefully make them better. There is also a very responsive and timely customer service department. Most issues posted here that forum peoples can’t handle are taken care of within days. Depending on where you are located, they also have shipping stock available in Canada and the U.K. The software is all open source, and the printer can be persuaded to work with repetier host fairly easily. Lulzbot provides a bunch of pre-canned profiles for slicing software, and you can certainly still download any teddy bear off thingiverse you so desire and print it, or make your own creations using your CAD program of choice. I run mine with Repetier host, Slic3r for slicing, and generate my designs from Autodesk Inventor. The Taz 4 also uses actual leadscrews on the Z axis, not the threaded rod that many designs use. I find that helps eliminate Z banding considerably.
Lulzbot also has a very active community support program if that is at all important to you. They have literally given away more 3d printers to community centers and hackerspaces, than makerbot has sold to those same spaces.
Some of the cons to the Taz 4 design, it’s big. If space is a concern, there are smaller 3d printers out there. Some people are also occasionally concerned by the fairly rapid version iterations that the printers are upgraded in. I personally find that a feature, not a detriment, but it’s worth mentioning in fairness. About the only other thing I would consider a con, is their shipping rates for smaller items can be a little high occasionally.
The enclosure vs. no enclosure debate really depends on where your machine is located. If it is indoors, inside a climate controlled conditioned space, the need for an enclosure is minimized. I don’t print with one, and I rarely have any issues. For those occasional larger prints that might benefit from one, you can always just put a large cardboard box over the machine. No enclosure makes access to parts and machine maintenance easier. Enclosure helps with minimizing layer splitting on large thin wall parts. For what you mentioned that you want to print so far, I would personally not be too worried about an enclosure
Any 3d printer is going to be much better than having no 3d printer, but I’ve been very happy with Lulzbot and will be sticking with them. I’d be happy to answer any machine specific questions if you like.