I own the previous version of the Saitara software - AC-7 Pro - and it absolutely will not work with Sonar.
I've had the latest version - AC-7 Core - installed and in-use for a little more than week now, and it is wonderful. Every one of the functions listed in the 'hidden' Mackie Control via Sonar manual (hit 'F1' when in the Mackie Control controller setup dialog) works as detailed. The AC-7 does not have a version of the pots that are on an actual Mackie Control, but it has a rather smart way of shifting the pot functions to it's virtual faders. The AC-7 is also the cheapest, full-featured wireless DAW controller you are likely to get your hands on. I suspect that remains a true statement even if you had to first run out and buy an iPad to run it on.
Technically, I run mine wirelessly to an Apple Airport Extreme that is hardwired to my custom Windows 7 64-bit PC running X1a. Communication with the PC is via rtpMidi software. It is functionally and visually identical to the CoreMidi network utility that is built-in to every mac. It runs quietly in the background and needs no attention after initial configuration. I ran AC-7 in Logic over the weekend at a buddy's studio, just to test is versatility and range of compatibility, and it is awesome.
Just for giggles, via rtpMidi I was even able to wirelessly play the software synths on my iPad using the Axiom 49 connected to my workstation. Latency was a bit high for practical use, but interesting nonetheless.
Latency when using the AC-7 Core is a non-issue on my system (I built the system about four years ago, so newer systems ought to perform even better). There is a barely detectable lag when pushing transport buttons. Barely. There is zero lag when moving faders, and pushing other buttons. I do not notice any lag on the bouncing meters nor timeline display, but they appear to be lower resolution (sampled/updated less frequently than you might expect) in order to avoid any detectable lag.
Super cool app, and incredibly useful at a price far exceeding the $8 that Saitara is actually charging.