The turtles I used to have never had problems basking & took to it within a week or so or having them but this one boy I've had from the shelter for (gulp) 5 months now, went up twice in the early days. Never again. I have an ATBA which I made & is exactly the same as I've used in the past.
Now, this guy did use it when I put cloth on the ramp but quit when I took it off. I removed it because his claws were causing threads to go into the water. Even if it was no danger to him, it would be to my canisters.
I plan to put him out everyday with sun, shade & a pool in the nicer months but it's still too cold right now.
His shell is still hard but 5 months & no basking has got me worried.

