I've just started using my Series 1 TiVo again after it was in a cupboard for a while, and I'm really impressed with how easy it was to burn the AltEPG ISO image onto CD and install it onto my TiVo hard drive. Apart from the usual faffing around with removing the hard drive and putting it into a PC chassis to update it, it was really quick and painless.
Also, the auto configuration of the network card is a huge step forward, as this used to be a real limitation - having to take the hard drive out to run nic_config_tivo to change the network settings.
TiVo #1 is currently organising its first download of AltEPG guide data.
I have another 3 or 4 TiVos lying around the house, so looking forward to getting them all up and running again. Then I would be able to help with any testing that's needed on guide data or TiVoWeb modules etc.
Congratulations to everyone involved and thanks for saving our S1 TiVos from extinction!