Ah yep that image retention was awful on their IPS displays. I've only seen worse on a Dell Latitude E7240, if that can be believed.
I used a G5 before my V30 and there was that and the GPS being useless on it. I even bent the GPS pins back into place to give them better contact and while that improved things, it was still rubbish.
The modules were interesting even if they were gimmicky and flopped hard. It helped when the charging port began to have issues, since I could just replace the chin to fix it. It was still a cool phone though. It felt like LG were the only ones still trying to innovate there, even if they often missed the mark.