Chamberlain

Contractor put a B750 in during remodel. Very slow my old lift master was a lot faster and quieter. A plastic cover was busted by contractor before installed. Contacted Chamberlain support through their web site to see about a replacement cover. Tech support replies then acts like they do not receive my reply to them. Waited couple of weeks and try again to have the same thing happen with a different support person.
Then Chamberlain sends me a survey about my experience with support. My responses to the survey explained what happened. I am still waiting for a reply to my survey. I mentioned if no reply that was their reply.

After any power outage the travel up & down memory limits are erased again. The logic board design is defective and appears to have no residual on-chip memory as past models had. This causes the travel bar to bend significantly and is a real safety hazard as it can snap and kill someone. They are aware of the problem yet continue to say that it is standard in some current models and it requires you to reprogram it after each and every minor power outage. They need to recall and replace these Receiver Logic Board #45ACT.

After talking with the Exec Assist. To CEO they had QC review the matter & view my video. They are now sending me a new Logic Board to replace the defective one under warranty.

Failed in heavy rain
I bought one of these about two years ago. It failed about a week before the warranty was up. It was replaced without charge. This replacement one was fine up to about a month ago (about a month after the warranty was up). It started to go off incessantly until I had to turn it off which is inconvenient when you are expecting deliveries. I took it apart only to find it was full of water and rusting where the batteries are secured. I allowed it to dry and cleaned it up with an electrical contact cleaner. Put it back together and hung it out again. Again, full of water within a few days. I repeated this process once more. This time I tried to seal the edge with hot glue hoping it would protect the interior but easily removed if there was another problem. It went off in the middle of the night. I've since taken it down altogether. There was not much water in it this time but it's still unpredictable and unreliable.

The company responded to my initial review on Home Depot Canada website saying they would contact me to resolve the situation and that I should email them. I emailed them 3 times but they never responded. I believe their response to my complaint on a public website was to make it appear as though they would rectify the situation but they ignored every email.

It's poor quality and their customer service stinks!