I've had the Naviplus since I got my LC400 from Eric Sarjeant in May 2021. Just replaced it.
The Naviplus was buggy. I had the major echo issue when anyone called inbound. It was super bad. Also frequently had to stop the car to reboot the system. Not that convenient when I'm on the highway, to say the least.
Final straw was when the system just simply locked up. No amount of tinkering could get it back.
NaviPlus company was HORRIBLE to deal with. They denied any warranty claim at all saying the unit was old. They had me try rewiring the harness, which was a major PITA. I was willing to swap out the unit and reinstall it. They wouldn't even do that. I will spare everyone the rotten level of communication from the company. Suffice it to say it was worse than bad.
As has become custom on this board, @Eric Sarjeant stepped up brilliantly. Having done the original install (morning soul on YouTube), he sorted me out with a new EC Offroad unit, and I even ended up $200 in the black. He did the refund without even messing around with the jokers at NaviPlus.
The EC Offroad unit has been rock solid. Install was pretty simple. It took about 2 hours, but honestly much of that was just extracting the old NaviPlus unit. EC Offroad has extraordinarly good video instructions - the best I've seen for dash removal. I'm sure I could do it again in under an hour.
I've attached a few random pictures of the install in process, but it's not meant to be a guide, check out the EC Offroad site for that. Last picture is of the NaviPlus unit in its natural habitat - where it belongs - the bin.
Don't even consider buying the NaviPlus. It's night and day between the products.