@gnoworyta - owned my AudioLab 6000CDT for a couple of years now. Never had a problem with scratching, but I can see and understand the concern. Some see it as a "potential" problem. Some see a tray as a "flimsy problem" waiting to break. There are "potential" problems in everything if you look. I believe AudioLab’s replacement to the 6000CDT (aka newer upgraded) changed to a tray just because they felt they may be loosing market share to a perceived/inherent problem with slot loading.
That being said, if you don't want to risk a slot loader I would recommend the newer tray model. I don't own one, haven't heard it, but if its anything like the 6000CDT it will impress.