I'm really glad the Dynon Skyview is coming (it would seem, though it's yet to be certified) but I can't get comfortable with it. It's just not for me.
You're talking about putting a lot of eggs in Dynon's basket -- a company who is just now venturing into certified avionics and is going head to head with the "big G," a formidable competitor to be sure. Then you're talking about a complete panel replacement, very difficult if not impossible to do in stages, so you have to pony up and do it then and there. From a business perspective, this is a gamble on the part of the end user, no two ways about it.
My other gripe with Dynon is interface. The Skyview is improved over previous products in this regard but it still has the look and feel of homebuilt avionics across the component group. It doesn't have the polish, slick integration and smooth UI of the Garmin products. The DNA of this company is in homebuilts, not retrofitting legacy certified aircraft.
All combined it comes down to Garmin being the better bet for me. The G5s are fantastic. Self-limiting? Okay, sure, they're not PFDs ala Aspen or even Skyview, but they're incredibly capable devices for pennies on the dollar compared to what was available recently. The G5 interfaces with the GFC500 and GTN650/750 series as well as older GNS boxes. Plus I can install the G5s today, and move into the rest of the suite over time as the budget allows. A $30k drop into the panel of my $90k bird all at once just isn't going to happen.
Finally, I think the expected installation costs of the Skyview are wildly optimistic. If the Skyview HDX with all the trimmings comes to your hangar in boxes for around $20k, I'm imagining a realistic budget of another $20-25k to get it all installed, not including the autopilot. There are savings, but not so substantial as one might expect for it being a Dynon product. For a relatively small premium you can deal with Garmin and not sweat the support or business infrastructure/long-term viability issues.
So for me, Garmin is the winner in this heads-up. Also of note, Garmin has been steadily releasing products, adding aircraft to AMLs and updating the existing new product lines in terms of software integration and additional hardware capability this entire time... Dynon has yet to cross the starting line.
Best of luck to them, though. Competition is great for all of us.