I thought I replied to this the other day but the post is missing. The Vintec type cabinets work using a compressor where as the lower spec cabinets have a thermoelectric cooling system, also called Peltier cooling.
Vintec have a bit of information in a customer only section of their website but there should be information about the pros and cons of both on the web.
For the promotion below, it could be worth to go to a local applicance shop and try and haggle them down on floor stock they might want to get rid of, especially today at end of financial year.