I have a DL1mk3 along with a Dash4Pro with the OLED display. They are for sale separately or together.
The same DL1 model was just used in GRM's September 2019 datalogger article as the high end option: https://grassrootsmotorsports.com/articles/data-driven-how-quickly-digest-data-quicker-autocr/
Latest Mk3 version with firmware updated, RT also has the new V10 software on their site, just released, check it out at the URL furthest down below. The DL1 for sale also has the 20 Hz GPS option for better results.
I have the hardware on eBay priced aggressively. If status changes or the ebay listing times out or for questions I can be reached at sjmarcy@gmail.com. I've been on this page for years, but just changed accounts.
DL1 LOGGER: https://www.ebay.com/itm/123957059788
Dash4Pro OLED DISPLAY: https://www.ebay.com/itm/123957071115
Thanks for your interest, these are great loggers and much more information can be found at:
http://www.race-technology.com/us/racing/products