Ok well I happen to like my lines so im gonna outline all the shit that i think people overlook or simply ignore.
Durability Problems
Yes, the reactors to have a durrability problem. Some of these issues have to do with the binding not being set properly, some have to do with it just not being built rugged enough on its tracks. Check your the toe height adjustment on your bindings, if its set too high your toe can move up and down and make it even easier to rip off an already questionable toepiece. That said next years batch have a bit tougher teeth in the toe piece anyway (and im guessing heel aswell?).
Weight Problems
If you hold these bindings in your hand, they feel extramely heavy compared to most bindings on the market. If you ski these bindings they feel lighter than any binding on the market because all the weight of the binding is directly under the foot. If anything they could actualy use even more weight in the toe and heel in the form of tougher materials.
Restricted Flex
Unlike most plate oriented binding systems on the market, the line binding doesnt restrict the flex of the ski. It is suspened a few MM off it and allows for the most flex of any binding i have seen (I would say any binding but im not really sure if the tyrolia railflex can compare, or if im just missing an entire line of bindings somewhere).
Prereleasing
Get your bindings set properly, im not going to say you should have a shop tech do it because if you just read the instruction sheet you should be able to do it yourself. The toe adjustment on these bindings is very often neglected even if you get them set at a shop, check that and make sure its good. The forward pressure setting is also very important, most of the complaints i have seen with this binding have originated with 'well i tested my freinds and i popped out within 30 seconds'. Chances are when you tested your friends the bindings were not set properly to your boot, just because the heel clicks down doesnt mean the binding is fit correctly. Check the forward pressure on the front of the toe, make sure the little metal prong is within '.5mm-2.5mm of sticking out'. Meaning withing those perameters to the tip of the plastic prong next to it, not the front of the toepiece.
Screws Losening
Yeah it happens, use some of the blue locktite sparay stuff it seems to work the best, or just check them before you ride.
Warranty Issues
Lines warranty is very very good. If you have problems with them directly chances are no company would have warrantied your product. Some shops may give you shit but id advise that if they do for you to contact line and explain your situation. If you think the return time on the warranty is slow, just think about the return time for warantying your knees.
With all this said I have more confidence in my reactors now than i have in any other binding i have ridden (p12s,fks series, marker frees/races,salomons). My only complaint about them is the required lift for a technology like this to exist. Oh, also i dont work for line or anything im just a shopguy that owns the bindings. If you've ridden the bindings and broke them and now dont like them, i can completely understand your reasoning for it but id just be curious as to how many people dont like them because of some of the above problems that are easily solvable.