10.5 was kind of buggy... but i was too thrill to try it... even working home for my job... found some bugs but generally works fine... was hoping for 10.5.1 as soon as possible :-) 10.5.1 solved my biggest stupid bug... i got no major problem after updating to 10.5.1... but it's true checking permissions take too much long compare to 10.4.11 and got some strange or spinning beach ball when surfing internet in Camino and even Safari... if u can wait maybe it's still better to stick with 10.4.11 for now :-), but leopard as great things already in and workin' blah, blah, blah, u decide!!