Just to clear up some confusion regarding various "flavors" of the same DVR in different territiories:
The "North American Market" recorder models that had TVGOS will function normally in the USA and Canada. This includes older models that were available in both countries as well as whatever recent "for sale in Canada only" models had TVGOS, such as the "Canadian" Panasonic EH55. These have analog NTSC-only tuners and were specifically intended for US/Canada use only.
"International" models sold by World Import, B&H, and other dealers incorporate the European off-air scheduling feature known as "Guide Plus". This is similar to TVGOS but *only* works if you are in a country broadcasting a PAL signal, which you can receive using the units PAL tuner section. When used in North America or Japan, these machines switch to their NTSC tuner sections and NO scheduling data can be picked up by their "Guide Plus" systems. The "Guide Plus" system can be pulled up, but only so you can use its Manual Timer screen, similar to the one TVGOS has. Some machines additionally offer a crude hardware-based manual "quick timer". To repeat, there is *no* TVGOS functionality in the international models when used in US/Canada. None.
Other than the dubious reassurance of getting "new in box", there is really no advantage whatsoever to a USA resident who buys one of the "international" models. They are ridiculously overpriced and more complicated to use. There are usually two or three reputable Canadian overstock dealers on eBay at any given time with North American demo or refurb units available at prices 30-50% lower than the "international" units. If the supply dries up it just means new models are trickling into the system, wait a few weeks and it will be a flood (this is happening right now with Pioneer). Or, you can contact a friend/relative in Canada to just go buy you one on sale in a store and then mail it to you (perfectly legal).
Granted, this applies more to Pioneer since they are still marketing newly-released (non-TVGOS) DVD/HDD models in Canada. If you prefer Panasonic for it's TVGOS feature, move fast because the supply is drying up: Panasonic has now pulled HDD-equipped models from Canada as well as the USA, and when existing Canadian stock runs out, that's all, folks.