I auditioned both decks - the DPS over at GT Audio and the Model One at Walrus systems!
I bought the Amazon Model One - that should give you some idea of my views!
I will elaborate and say that I really found it a very hard decision and part of it was due to the issue of specification which I'll address as follows:
The bearing of the DPS is ruby, the Amazon is ceramic. Ruby is ordinarily superior, of that I have no doubt, but those of you who know of long term ruby bearing turntables are limited. The problem is on an engineering level ruby bearings have a tendency to crack and/or shatter. This was the main failing of the Pink Triangle Anniversary export. In practical comparison I think their was no audible difference to my ears.
Motor - the Amazon Model one has an outboard DC motor that is battery powered, the DPS has a Berger motor mounted that is AC with an external power supply. The Amazon motor whilst not having the torque or the probable ulitimate pitch stability of the DPS and/or any AC motor more than makes up for this with no cogging effect at all which allows you to hear into records better. In addition to this the noise floor is exceptionally low. This means that the dynamics are more evident and everything comes out of silence - even the clicks and pops!
Finally was the issue of upgradeability - as far as I am aware Graham Tricker will make, or does make a DC motor for the DPS with which to upgrade - thats' it! The Amazon can be upgraded to Reference standard for £2500 which means it is a no cost option. The package includes a new bearing and a composite platter of lead, acrylic and titanium.
As a final thing, you should have a look at the Lyra Audio website and their show stands. I believe they use the Amazon to develop their cartridges, and used Amazon model two's and the Reference to front the Connoiseur Definitions Amplifiers - the Model 3 pre amp is £60,000. Enough said?