my experience with leopard
i did a clean install on powerbook 1,25. it took less than 40 minutes, i didnt install any drivers and only english and norwegian language. Apart from one RAM keep freezing the installer it went smooth. (This also happend with installing tiger). Fix: remove the RAM then install, then insert the RAM back in.
System overall is faster, and after the keychain and login update, internet is working perfect.
This is not working perfect yet:
Skype, needs to reinstall everytime i want to use it (although its a workaround on the net now). Google it.
Yahoo messenger, is freezing for seconds or unexpectedly quits often.
Photoshop 7 is no more working on my machine, i wont update this.
Itunes use looong time to open and iphoto seem slower.
Number seems faster. Photobooth are so slow it cant be used, (with a firewire cam).
I think its a bug in the adjust color in preview. Its not changing much, its lagging, and when i save the color adjustments are doubled.
I liked the firewall in tiger better. Now i dont know.. is it on?is it off?
Im testing it on my studiomac too, a 867 quicksilver, with 1,5 RAM; the system works very nice, but Cubase 2.2, seems to be slower, Im not sure i will use leopard for this.
For the sport i tried to install it on a double 500 mgz. Its working ok, its slow but usable, but only for web stuff and easy tasks. I can see why apple didnt recomend it coz all the interface bling are much slower than tiger. And iworks trial didnt work.
Overall i really like all the new stuff, its well worth the money. The system is generally faster in everything and the new stuff is great. The comming updates will make it even better!