The XR4 is not the newest Octane recumbent elliptical, but it is still considered to be top-notch. Originally designed as a commercial unit, it’s great to have an at-home option from a brand that is so highly regarded in the fitness world. For those with back issues, the seated elliptical is very appealing and ends up being much more effective both in terms of physical results and personal comfort. The XR4ci features a heart rate control feature that is utilized by many, and both models improve significantly over the XR3 thanks to its upper body workout option.