I talked to these people and they are very nice, but they really don't have anything. The engine they ran in the past was a totally different prototype. The engine they show is a plastic model. They may never come to market, but wish them luck.
Sorry if somebody said this already, but one of the flying magazine (sport aviation, kit plane) showed an RV 10 with a turboprop 2015
https://www.kitplanes.com/turbine-powered-rv-10/
This the PBS TP100 Czech Republic engine maker. The article talks about $175,000 for a FWF package. I assume that is w/ prop? No word in 6 yrs.
https://www.pbs.cz/en/Aerospace/Aircraftgines/Turbopropgine-PBS-TP100
Boys and Girls, any turbine is going to burn more fuel and cost more to buy. Where the turbine comes into play is reliability, TBO and performance for aircraft needing or designed for more HP. This is important in commercial (that needs reliability and time on wing and haul paying ppl or cargo), Military for performance. For GA piston is still king in the sub 300-400 HP range.
The GO TO small turbo props is the Allison 250 (now Rolls Royce). It has 317HP (and more in later variants) and used in helicopters and planes like Helio Courier and the SIAI-Marchetti SM.1019 . Sadly a SIAI crashed July this year, Lewiston, ID, killing former Military Pilot Dale Snodgrass, a legend in the F-14. It had nothing to do with the engine. The 1019 is a high wing tandem reconnaissance type plane based on the O-1 Cessna Bird Dog with a turbine engine.
Other engines like the Garrett TPE331 (600-1000HP) and of course the famous PT-6 are great turbine engines. The Walter PT6 clones from Czech Republic could be had for $60K 20 years ago or so. Not any more GE bought them (buy the competition). The cost is now PT6 prices. However back in the hey day, many found their way into Experimental planes. To buy any certified turbine engine will be big bucks. The TBS TP100 is based on small drone or RC model type engines and low cost manufacturing technology. Does not mean they are bad, just not the same bona fides as a "real" turbine.