Johnny, would I be able to use in-ears monitors that include my vocals with this device? The thing about the Rolls was that it had separate inputs and controls for vocals, one keyboard and the whole band. Sadly, the Rolls was short one keyboard input.
 

Sorry if there is confusion. Your after 3 different thing so I'll clarify. 
 
The Radial DI would solve the 2 Keyboard problems for you. 
Either that or a Keyboard mixer amp with DI and Line out. 
A powered speaker (or keyboard amp) would solve your stage monitoring for the keyboards. 
The Rolls would give you a in ear mix of Vocals and the band Vocal as well as a keyboards if needed.  
 
The Radial DI can mix up to 3 keyboard as well as a USB from a laptop using VST's so thats 4 instruments. 
It will send that to the FOH in mono or Stereo and also send to your Rolls for your in ears.
 
You could split the XLR or 1/4" monitor outs to feed a stage monitor,, that's what I would do because as I said, your not going to be very happy only hearing your keyboards with in ears,,, they are good for vocals but instruments are tinny. I've only ever put my Vocals and then the other band vocals in mine. 
As I said , with the mixer in the Key Largo  you would save money and not need a keyboard amp. You would only need a powered speaker. 
If you buy a Keyboard amp then your don't need the Key Largo or a powered speaker. You would use the keyboard amp as the mixer and DI output. It would need a Line out as well as the DI if you plan on feeding the in ears. I like the Key Largo because your mixer is where you can reach it,, an amp might be be out of reach. 
 
You still need the Rolls if your using in ears and desire a personal mix. Otherwise your in ear mix would have to come from the FOH or Monitor mixer. 

The more I look into the Radial DI box, the more I am sold on this device. I don't need a new amp, just some better routing options, and this has so many useful features for less than the cost of the KDX15 I was looking at. Takes up less space, too.  I'm gonna order this baby. Thanks, Johnny V for all the help. I've been on this forum for a loooooong time, but there is always something great happening and more to learn. Hope to get this thing in a couple of days and really dive into it. Since I have also toyed with getting a laptop for my best softsynth sounds I use in the studio, this would have me covered there, too. Psyched!

Arrived today, hooked it up, it does what it’s supposed to do, and very well, but need. Only wish I could hook up a vocal mike with it, then it would permanently retire my mixing board. However, for any of my band gifs and gigs with a House PA! It’s all I need, and in the future I will hook up a laptop and use my best samples via Kontakt. Very pleased though and hope to be lugging both my keys to the next gigs coming up without annoying hookup and monitoring problems. And Stereo for my keys, at last. Thanks to Johnny V and others for their suggestions.

Right on, You cannot go wrong with Radial products. And even the Rolls stuff , it looks cheap but I have some Rolls boxes that are 25 year old now and seen a lot of use, still working. If I remember correctly they cal them Solution Boxes.