My truck goes thru regens too frequently, (within 200 to 250kms), and I've heard negative's from other members who have he Celtic tune. I wanted the GDE, but didn't have the $$$ for it last year, so the Celtic was the cheaper option, plus I wanted to have my EGR shut off. Just my $0.02
New member to this forum, currently have a 2016 Eco Outdoorsman. I'm switching from the Celtic tune to the GDE within the next few weeks, have 62xxx kms on my truck thus far. Came across this forum thru a google search, I'm currently a member on Ram1500diesel.com