Coolsat USA currently offers Repair & Upgrade Program with a discount for its older models Coolsat STBs 4000, 5000 & 6000 to be exchanged to new models Coolsat 6100 & 7100. What are the major Feature & Connector differences btw these older and newer models that would justify such upgrade for an extra fee? Or its just an attempt to improve STB sales and hold prices up that dropped drastically down after "support" for the STBs has being discontinued? Any serious performance differences btw the old and new STBs? Which one of the older Coolsat models is the best - they seems to be all sold for about the same on Fleabay?