Karadjgne :
They are full towers. The word 'massive' often comes to mind. The sheer size of a full tower creates 2 issues generally.
First is airflow. There's a lot of space in a full tower, high volume of air, that over time will heat up. This takes multiple fans and a good fan curve setting to actually get all that air moving, and not leave stagnant 'hot spots'.
2nd issue is wiring. Everything will be too short. Psu leads are only so long, so having them tuck out of sight and be all nice and presentable, especially any leads like the EPS to the top of the motherboard, is often an issue without extensions. This includes fan leads on many motherboards that don't have sufficient headers strategically placed on the board or any usb/audio cables from the front Jack's.
A possible 3rd issue, for me, is aesthetics. Full towers have a huge amount of space. Your components, especially mATX and mITX mobo's, only take up minimal room. Everything looks tiny.
To me, full towers have limited usage, full custom loops, excessive amounts of hdds, triple or quad sli on E-ATX motherboards etc.
Honestly, as good a case as the 730/760t is, something like a Phanteks P400S or NZXT S340 mid-atx towers is a better design for starting builders.
To me, "massive" is super-tower ATX case, like Corsair 900D (
specs), while full-tower ATX cases are just right in size wise. Mid-tower ATX cases, in the other hand, are a bit too small for my preference.
What i like about full-tower ATX cases the most are 2 things:
1. lots of space inside it, making it easy to work in it
2. it's size has majestic looks (something along the lines of: the bigger, the better)
While full-tower ATX cases have a high volume of internal air, once you populate all fan mounts the case has, you can easily move all that air and also do it quietly enough that PC won't annoy you in a quiet room. 140mm fans work better with it than 120mm fans since those move more air and also do it more quietly than their smaller counterparts.
Wiring wise, i have lots of excess cables behind my MoBo tray and i haven't used a single wire/power extension. Also, most modern PSUs have long enough cables to reach everywhere even in full-tower ATX cases, including EPS12V cable.
Can say for sure that Seasonic PRIME 650 80+ Titanium and Seasonic M12II-850 EVO cables reach just fine. Though, Seasonic S12II-520 EPS12V cable is too short for it to be used in a full-tower ATX case. Just need to make sure that EPS12V is 650mm long and not 550mm long when using full-tower ATX case, else-ways, power extension is needed.
Aesthetics is personal opinion and there's no point to discuss/argue over it.
While P400S and S340 are popular at current date, those two cases have 1 mayor flaw in them and that is solid front panel. All cases that have solid front panel have handicap in airflow. While it's possible to get proper airflow in a solid front panel case as well, one needs to use high-end fans with high RPM which in turn increases the noise coming out of the PC.
Great example is Cooler Master MasterCase H500P,
specs: http://www.coolermaster.com/case/mid-tower/mastercase-h500p/
in-depth video review:
https://www.youtube.com/watch?v=HRsb4C5gLLc
While the case does look stunning, it's solid front and top panel design is so bad that it made this case one of the worst cases when it comes to the airflow. Also, there are plenty of other things that are wrong with that case as well.