I have had only two different Kenda tires, one set was the Kwest for a MTB, and the other was the Konstrictors for my road bikes. I can say I love those two models. The Kwest lasted 10 years not only for trail use, though I don't like MTB'ing that much so I didn't put but maybe 1,200 miles doing that, but they lasted a very long time on my trainer, probably about 3,000 miles. The Konstrictors surprised me, I got them on a close out of that model for $19 from $44 and bought 4 sets, when I first got them I almost gagged because they were so thin in the tread area! But now I have over 4,000 miles on one set and I've only had one flat, only two very small cuts (one resulted in the flat, I sealed both with Gorilla Glue), and I ride over glass a lot, and they still look good to go for awhile yet! They have great traction in both dry and wet conditions, I would not hesitate to buy another set of the newer model if they went on sale.
I had a friend that bought a set of Kenda Kaliente Pro's this last spring due to me having such great accolades for mine, and now he's hooked on those.
Problem with Kenda, and this is true with any brand, is their cheapest tires are junk, to go out and buy a $10 tire and expect it to be a great tire is not fair to judge any brand of tires with. While it may be true that Veloflex doesn't make bad tires they also don't make anything less then a $45 tire so yeah, the entire line will be good; but when a brand like Kenda or Continental, Michelin, Vittoria, etc makes tires from $12 and up you're going to have issues with the lower costing tires.