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I think Leopard would be best for you. It's not running so amazingly on my PowerBook. I love the new features and UI. I run leopard on all macs now. It's a lot nicer. You have a nice new intel mac, go for it.

10.5.3 is crappola, I'm STILL in huge amounts of grief waiting for my extreme to reboot!
This is my third day of sitting up most of the night running disc utility and restarting the MBP.

Please mother of God help me.
 
I haven't used Leopard very much at all...

I had it on my Macbook for a brief period of time.. but switched back to Tiger cause it felt too different.. I also remember some compatibility issues.. but then again, I was using it when it was just released. Am I missing out on anything here? I'm pretty happy with Tiger. I was going to format the HD but was thinking about buying Leopard.. but I could always keep using Tiger and save that money towards the new iphone or something.

I'm kind of in the same boat, although I don't own a copy of Leopard; only chances I've had to mess with it are in the stores.

I personally haven't made the switch because there isn't any driving reason for me; all the apps that I use still work in Tiger, and until one of them requires Leopard (like Adobe CS4 maybe), I'm not apt to change.

I'm sure there's a lot of cool things that make Leopard worthwhile. Time machine and quicklook would probably be godsends, but I already have a manual backup system going and I tend to use Quicksilver instead of the Finder/Spotlight anyway. Spaces is unnecessary when Expose still works wonderfully. Anything else I'm either not aware of or is just glitzy cruft (not a fan of the new menu bar and dock).

I'd like to wait until Snow Leopard arrives before upgrading, although I hope it comes out before I graduate college so that I can still get it at a discount. It won't be all that different from Leopard I don't think but hopefully the speed increases will make it worthwhile, and by that time there might be some app that requires the architecture built into Leopard/SL.
 
I don't know what people are complaining about when it comes to Leopard. I think it blows Tiger out of the water. You are missing out on a ton of stuff. Especially if you Mac has a 64 bit proc.
 
I'm still on Tiger. I bought a Mac around Christmas 2006. I was thinking about waiting until March for a possible Leopard/Santa Rosa update but I'm glad I didn't. (I would've ended up waiting almost another year.) This Christmas I'll have been using Tiger for two years and I just don't see the need to upgrade to Leopard. Firstly, there's other things that ~$100 could be used for in my case. Also, with the recent announcement of Snow Leopard, I'm positive I would wait until that comes out.
 
When I got Leopard the night it was released, I was ready to go back to Tiger. I decided to wait until some updates came out, and now it's fine. It definitely took some getting used to. I found the new UI a bit flashy and lacking "Macness". The new Finder also drove me crazy. There are some features that I couldn't live without now, like Quick Look, Spaces, and the enhanced networking features like Screen Sharing. I'm pretty glad I upgraded it. However, if you're happy with Tiger, stick with it.
 
I received Leopard the day it was released and I haven't regretted upgrading at all. I don't see any serious differences in the two. I would give Leopard another try. I, personally, happen to like the new dock and look of Finder. It was easy to adjust to.
 
i switched my emac last week from tiger to leopard. you don't miss anything. there is so little change that i was too lazy to switch my powerbook from leopard to tiger.

maybe when mobileme is released then i'll switch the powerbook as well.

aside of that leopard is running fast and stable for me.
 
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