The standard Orphan Espresso Pharos is documented in detail on the OE website including the statement "We fully recognize and support the concept that the owner can and will MOD the grinder." My understanding is that OE aimed to provide the best possible grinder at a price that allowed people to own an outstanding grinder at an affordable price. The design upgrades and additions could go on forever but would also push up the price. The Voodoodaddy modifications appear to be the most popular and well documented upgrade. The main difference is that the standard Pharos dispenses the grinds via a funnel, the Voodoodaddy mod uses a stainless cup/ bowl to catch the grinds which is then removed to transfer the grinds to the portafilter etc. Other mods include a graduated scale to assist in dialing in the grinder and resetting, a different method of locking the grind setting and then there is the bling factor of stainless vs plastic spacers The Voodoodaddy modifications are not neccessary but some users prefer to have a different way of accessing the ground coffee, accessing the lower burr for cleaning, setting the grinder etc. This becomes a user based decision and does incur additional cost. The user can have the full upgrade or select the parts of the upgrades that appeal to them. In my case I chose to add the Voodoodaddy modifications. I use the Pharos for espresso and use a LIDO for Aeropress, syphon and pourover. The OE grinders are excellent value for money and the Voodoodaddy modifications are manufactured to an extremely high standard. There are pages and pages of feedback and notes on Home Barista, good Xmas reading if you are contemplating an upgrade