It’s early for the Esri LAS Optimizer, but these reviews are from 2 of the key people.
From Lewis Graham, one of the developers of LAS:
“You can download the Esri Compressor/Decompressor here:
Used this today to post some files to our FTP site. Good compression and super easy to use.”
From Martin Isenburg:
“On the train to the airport I finally found some time to play with the new LiDAR compressor of Esri myself. First impression: solid! Nice piece of work so my compliments to the many tireless hours the Esri I developers must have worked on that. Compression is fast and compression rates are state-of-the-art.”
There is a concern about it not being open source. From Doug Newcomb:
“If the format is not fully documented, it’s not an open format. Dealing with closed formats is a pain point for me that api-only access does not resolve.”