Mine are now running into their third season. No core shots and only one edge crack.
The last day of the last season, I developed some tip delam on one ski which was easily fixed with some marine epoxy. I also had about a half an inch of edge pulling from the ski which was also easily fixed with marine epoxy and consequently caused by not getting enough pop onto a rail...
I ABUSE these skis. Rocks, to stumps, to whatever I can dick around with on the mountain. I love abusing them and they seem to keep coming back for more. I picked up a pair for $200 making the abuse even more enjoyable to dish out.
No top sheet means damage will show extremely fast. I do enjoy the weathered wood look though, but be prepared for that.
The bases are perfectly fine AS LONG as you are good to keep them waxed. I wax the bases every other day. The only time speed as been a problem are on hot spring days with super sticky/heavy snow.
They do develope a bit of "rocker" because of their soft nature. They also lose the majority of their camber. IMHO, this makes them even more fun.
Little bit of a disclaimer, I don't spend as much time on the rails as the majority of you parks rats. My seasons usually last anywhere from 15-25 days, so all in all these skis have seen a solid 45+ days.
For my style of skiing, I have loved every second on them. They are a VERY fun and playful ski at a very inexpensive cost. These skis are a blast to abuse and perfect for a "disposable" park ski.
Let me know if you have any questions.