Pros This is a leaned out version of Leopard, more responsive 64 bit OS.
Cons Both newer Mac's I updated to Snow Leopard have had issues with Networking.
Slow web page loading, networking connection issues.
Summary This is a faster OS then leopard because of the 64 Bit OS of Snow leopard. But its not without issues. I have two Mac's a MacBook and a Mac Mini. Both I clean istalled Snow Leopard on. Both having similar network issues. Such as very slow page loading in Safari and other browser's. Both have trouble nogotiating network connection at times. Both did not have any of these problems when using Leopard 10.5.8. So I have to conclude that Snow Leopard somehow is causing these issues. Also the Windows computer's on the same network not having any of these problems. Hopefully Apple will address these problems in future updates.
Pros A few interface changes make it feel more modern
Cons Claimed performance enhancements are not noticable on my iMAC. Safari still chews CPU when started (despite many cleaning attempts)
Summary As an Apple fan for decades using MAC since early 90's and NeXT too, Apple seems to have missed the target with Snow Leopard. OS X is still excellent as is the iMAC hardware. The Macbook Air is unbeleivably excellent. But Snow Leopard, well.... My Dad has an iMAC and I know he just wouldn't know the difference after installing Snow Leapard. After a month, All i can tell you is that the dock has different context menus. I'd expect a change like this to have well publicised kernel or framework whanges to position for the future. If that's not what it's about then it seems to be a more cynical attempt to pump up revenues.
Pros None compelling enough to stay with Snow Leopard
Cons MS Office for Mac apps crashed regularly under Snow Leopard
Address Book crashed
Parallels Desktop ran much slower
The scanner on my HP All-in-One does not function under Snow Leopard
Summary It baffles me that all the reviewers gave Snow Leopard high marks, but user forums report widespread dissatisfaction. Nothing worked better and almost everything worked much worse under Snow Leopard.
Also, why have none of the reviewers written a retrospective on Snow Leopard?
I reverted back to Leopard.
Cons Crashes more! Slows your computer (identical to what cnet reports) Drivers and support not yet available for many programs (as of sept 28th 2009).
Summary When i purchased my unibody macbook pro in april 2009, i bought the absolute best that apple had to offer. My unibody macbook pro is definitely slower with the "upgrade" to snow leopard despite apple's claims. Not only is it slower but apple's own programs crash much more then i have ever experienced (mac user for well over 10 years). My wife and i upgraded at the same time and we both noticed a dramatic drop in performance in our notebooks. Overall, i'm really disappointed in Apple for releasing this product and upset that i spent the $29. Don't get too greedy Apple!
Pros 1. It's a little more faster and lighter.
2. Finally an antivirus - a pretty useless one, but anything is better than nothing.
3. Hoorah !! Exchange is here!
Cons 1. The installer is a POS: an 1,5 hour for a clean install - more than Vista an a joke compared to the (free) PCLOS - 20 min including partitioning and formatting of the hd plus the setup of the GRUB.
2. Everything else is the same -no new features.
Summary Why spend money for something everybody else is providing it for free?