Check this out : Daystar, Inc. for CPU upgrade! Reliable?

I recently bumped to a highly tempting news : it is now possible to upgrade my iMac FP 17" 800MHz to a faster 1.35GHz, along with larger internal HDD, RAM and Optical Drive. The only option not available is the Video Card (they say it's on-board by default and cannot be replaced).
A company named Daystar offers a low-cost CPU upgrade for the following iMacs (the right-hand GHz is the available upgrade specific to each model):
15" 700MHz to 1.35GHz
15" 800Mhz to 1.35GHz
17" 800Mhz to 1.35GHz
15" 1.0G to 1.92GHz
17" 1.0G to 1.86GHz
17" 1.25G to 1.92GHz
20" 1.25G to 1.92GHz
They say the upgrade is available for as low as $449.00. For additional options additional cost would apply, but anyway. I wonder if anyone had heard this before?
Here's the link to Daystar, iMac FP upgrade section.
http://daystar-store.com/index.asp?PageAction=VIEWCATS&Category=732
I mean, this really sounds sweet but how reliable is this? I thought iMac was basically a non-upgradable system, except for its external RAM and Airport(Express) network card. Pretty impressive, though. Surely worth a glance for those of us considering serious upgrade (like me).

Hi,
FWIW....
Modifying some thing that was designed for a very specific purpose usually ( in my experience ) leads to problems further down the line. The excess heat may cause problems. Taking the thing apart and re-assembling may lead to others. Buying a newer, faster machine seems a far safer option - To me at least!
Regards
Ian

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