I have three total and I used the first one for about five days when the metal around the neck broke off. I thought I would be more careful with the second one by holding the metal around the neck when un/screwing the mouthpiece off and on. It broke the next day. I superglued the second one back on, but it doesn't work as good. Probably has some air leaking somewhere. I got the third one out last night. So far so good, but I did put superglue around the neck just in case it got any ideas of breaking.
I really, really love the LR (haven't tried the SR). I get a huge amount of vapor and flavor (along with little flavor blasts) from them with a very short pull. It closely resembles smoking to me. I'll probably keep using them, but I'll probably reinforce the neck on every one. It sucks they break before the atomizer gives out. I am going to try a tank though with a carto in it to see how that works. I hope I don't get a mouth full of
juice like happens with the regular carts.
I haven't had a problem with cracks around the bottom, but I have heard of others that have. I wish they would use a little thicker glass. I'd pay a dollar more for each one if they did.