The bike doesn't move around underneath you like out on the road, it is more uncomfortable for longer periods of time. I would say if you're speccing a 100% trainer bike, I'd go for something slightly more padded
I've never bothered with a different saddle for my bike on the turbo but I can't do more than an hour before discomfort whereas I can ride for 4 or 5 hours outdoors on the same saddle.
So the SLR is probably fine for 30 minute sessions, give it a go
The bike doesn't move around underneath you like out on the road, it is more uncomfortable for longer periods of time. I would say if you're speccing a 100% trainer bike, I'd go for something slightly more padded