I have the Veloflex Master in 23 mm. It has the most supple casing and especially tread of any tyre I have used. Feels clearly different from conventional tyres in the hand and on the road. Rolling resistance has been
tested at Bicycle Rolling Resistance as pretty good but not exceptional. Presumably it performs relatively better than indicated due to lower suspension losses for a given pressure and/or the option to comfortably run higher pressures to reduce losses to hysteresis.
Puncture resistance is negligible. I mostly used these tyres for riding at Longchamp and got several punctures from glass on the 5 km way there (by comparison, none over ten times the number of Longchamp trips with the Schwalbe One HS448 although that tyre is unusually puncture-resistant for its speed). The tread suppleness comes from the seemingly total lack of a puncture-resistant belt (though I’ll only know for sure when I cut one open). If there’s a belt there, it’s not the usual sort.
Wet grip is not great. Wear rate is pretty good but there’s little rubber to wear. One of mine, the rear, suffered partial delamination of the tread from the casing early in its life. The two tyres I have have greatly different bead lengths making one easy to fit and the other hard.
Skinwall tyres supply an attractive contrast against deep carbon rims but get a bit lost against shallow silver rims. That didn’t stop me running them, mind you.