I've just ordered an Oartec Slider rowing machine for the bad weather days down here in Florida. I was initially going to just get a used Concept2 D with a PM4 and started looking on eBay for one - I was attracted to C2 by their holding their used prices and the ability to use RowPro. Then I looked at the C2 Dynamic the started googling opinions then discovered dynamics and sliders in general and a few opinions on the rowing boards (on the water people). Then checked out the Oartech videos. I think in the end, the balance of opinions on the Oartech’s perceived superiority with ref to on the water swung it. I like the feet together thing and also the overall size. Plus, it looks cool :-) The one big and only negative point was the clunky looking monitor and no RowPro hookup - any outlook/intent for an upgrade in the future I wonder? I look forward to delivery and will be blogging on my progress with it. I’m an old person just rowing for fun/fitness really and am using an excellent Edon TS515 which is a robust "kayak-material" training scull that fits your garage. I’m hoping the Slider will compliment the Edon nicely and help my on-the-water times.