tldr; The previous generation Concept2 (rebranded to RowErg). Features identical air resistance flywheel and PM5 monitor to current models. Reddit confirms Model D and RowErg are functionally identical - buy whichever is cheaper used.
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Best praise vs top criticism for Concept2 Model D
“I started a new job a little while back. They've got an on-site gym and I wanted to get back to it, so I checked it out. I was happy to see Model D's with PM5's as that's what I was used to. Went to go use them, found they'd removed batteries and never replaced them after a small leak so the PM5 only stays powered on for a sec. Fine.. I take a USB battery pack and cable up the next time. Still can't connect my phone and the interface is different than I'm used to. Check the settings menu.. Oh.. its running firmware from 2014. I see. Gonna try and stealth update them next week.”
“I agree 100% but please elaborate on the Rogue erg? I’d never buy one but I do think they added a few quality of life features that C2 could be adding at this point (the shoe strap thing, better folding etc). The model D is a timeless classic, but I think we’d all appreciate a model F with these features so long as they remain as bulletproof as they are on the model D”
189 Reddit opinions analyzed • Last updated 2/24/2026