The Rational Fitness blog has written a detailed review of Oartec Slider, Rowperfect Indoor Sculler, Concept 2 Slides and the Concept 2 Dyanmic ergo.

The Author writes in the comments below the article

In-so-far as technique goes, I think the Rowperfect is the best machine. There are a lot of good programs now using the C2 dynamic with their rowers. I would think that if technique was a huge shortcoming with that machine they wouldn’t be using it. I just think it feels a little different than the other offerings. Xeno Muller is an olympic gold medal winner, he likes the C2 dynamic. For a contrasting view search Carlos Dinares on youtube. He talks a lot about the C2 dynamic and compares it to the Rowperfect RP3. Keep in mind he sells the RP3 so take it with a grain of salt.

To summarise his findings:

Oartec Slider

• Solidly built and has a good flow when you get it going
• If you get out of synch with it you will bounce back and forwards
• Requires 10 feet space to use and does not dismantle for storage
• Monitor – just decent, stores 1 workout, no log card, no pace boat, had software glitches, does not measure up to C2 monitor.
• Can only display 1 of optional data points (drag factor, hr, stroke length, drive ratio, strokes)
• Extra heart rate pickup for Polar HR sensor
• User swapped out seat and handle for preferred alternatives
• Price USD $1295

Rowperfect Indoor Sculler

• Feels like being in a single scull
• Limited tilt seat forces core balance
• Easiest of thp all to put together and easiest to transport
• Design is pretty simple and quite brilliant
• Monitor is easy to use and allows boat class selection, results are weight based
• Display options include watts, stroke length, meters per stroke, total strokes, and also a cool function showing watts per heartbeat.
• You can’t set the monitor up for intervals, software updates involve sending monitor back to Canada or Australia
• It’s the loudest of all the ergs
• Requires 7 feet of space and is a lot smaller than the C2 or Oartec
• There’s nothing holding the seat in place like a bungee and if you get sloppy with your technique it tells you
• If I was going to do a long session it would be a no-brainer, I’d do it on this machine.   Both the C2 on slides and the Oartec feel heavy and slower by comparison.
• Price USD $3000+ expensive

Concept 2 on Slides

• Been around for a long time – add slides to a regular C2
• They require a lot of space – 11.5 feet
• Using thp they feel like an Oartec
• If you already have C2 this is an inexpensive add on
• I put a coreperform seat on my erg to get the tilting seat feature that I have on the RP
• Feels like a heavier boat compared to RP
• Not even rpotely portable
• Price USD $1,340

Concept 2 Dynamic

• I worried about location of the flywheel under the rower with sweat dripping in but this is a non-issue as fan blows it away
• Has a cord instead of a chain attached to handle. There is a potential for wear over time and C2 includes an extra cord just in case.
• I think the dynamic movpent of this machine is ok.
• It feels more similar to rowing a single after I put on the coreperform seat.  (I still like the RP seat better than the coreperform though).
• I feel the connection between the footplate and the handle and I initially felt that I had no problp suspending my bodyweight.
• However, the way I think i make this happen is by opening my back too early.  I figured this out because my back would bother me after rowing on this and I couldn’t figure out why.  I think there may be a bit of slop in the foot to handle connection based on the design.

Didn’t like

• relationship between seat and stretchers, I can’t find a happy catch position
• bothers my back a little
• tiny bit sloppy at the catch (all of the above could just be me)
• The machine is fairly quiet and the familiar C2 PM4 is as reliable as ever.
• There is no shock cord retracting the handle on the recovery on the C2 dynamic.
• As far as actual technique, you can get away with a lot of bullshit on this machine since the seat travel is limited by a strong bungee so if you get out of kilter you won’t hit the frontstops or anything.
• I don’t sense a lot of punishment for poor technique.
• Size just over 6 feet; it is pretty heavy and can’t easily be taken apart for storage.
• Price USD $1,400 with PM4 monitor