Upgrading to new Mac OS X v10.5.4 Leopard? Is it worth it?

Hello,
I'm wondering if would be advisable or even possible to upgrade my os to the new Mac OS X v10.5.4 Leopard. I seem to come across issues where I can add new software as they require OS 10.4 or higher. My PC configuration is as follows:
Machine Model: iMac G5
CPU Type: PowerPC G5 (3.0)
Number Of CPUs: 1
CPU Speed: 1.8 GHz
L2 Cache (per CPU): 512 KB
Memory: 512 MB
Bus Speed: 600 MHz
Boot ROM Version: 5.2.2f2
GeForce FX 5200
Hard disk: 80 GB
System Version: Mac OS X 10.3.9 (7W98)
Kernel Version: Darwin 7.9.0
Thanks for your help in advance.
Regards,
Kash

If you need to use software that requires it, then sure, use it. Your iMac is very capable, but there are just two caveats:
- Buy more memory, perhaps another 512MB or 1GB, all those whizzy new features and functionality will require memory to run. Memory's never been cheaper.
- You're going to lose the use of Classic, so any software you currently use that requires OS9 or Classic to run (or to install, even if there is an OSX patch later) will cease to work.
And maybe one more caveat, there's just a lot of other older software that is broken by Leopard (OSX 10.5). A search with Google will find a wealth of information of any issues with a software package and Leopard, it's been out for a year, so there will also be patches or upgrades available for most.

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