1GB Memory Modules in 1GHz 17" Flat Panel iMac?

Hello There!
On searching this forum I see that there has been some discussion of people going beyond the stated maximum memory of 2x512Mb by using 2x1GB DIMM's from companies like RamJet.
1. How many people out there have successfully done this?
2. Any problems mixing a factory installed 256MB module with a 1GB in the user accessible slot?
I like to buy my memory from Crucial and, whilst they will sell me the 1GB modules, they won't guarantee they will work or support me. I'm hoping you guys can give me a bit more confidence before I take the risk.
Thanks!

IanB, 
1. I have 1.5Gb of RAM in my iMac 1.25GHz with no problems. There are numerous other users in these boards with >1Gb RAM.
2. iMac G4's use single channel RAM and so there is no issue with installing RAM in any combination.
3. iMac G4 <1GHz max out at 1Gb. iMac G4 ≥1GHz can take 2Gb. <p>
4. IMHO 1Gb SODIMMs are prohibitively expensive in the UK and probably not worth the extra cost. I've never used the full 1.5Gb RAM available in my system even with EyeTV, iMovie HD, Photoshop Elements and iDVD running together. I installed a 1Gb DIMM and 512Mb SODIMM which is a significantly cheaper combination.
5. Both my 1Gb DIMM and 512Mb SODIMM are from Crucial. The DIMM I bought as a unsupported/guaranteed as a specific part-number and the SODIMM I ordered through their iMac G4 page. Crucial only support Apple's specs even though they are essentially wrong.
regards
mrtotes
Off topic:
Ian B(ickerstaffe); you were right yesterday there are two Ian Bs!

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