Jim,
Hi. I have a Junghans Mega Futura and I really like it.
I bought it mainly for the asymmetric styling and large display rather than the radio control functionality but over time I've warmed to the fact that I can always trust that it's dead on accurate. I live in the US (midwest) and I haven't had any issues with it synchronizing. It takes a little while - each morning at 2am it spends a few minutes synching during which time (< 5 mins) the display is blank. I've found that I like having a watch that I can use to synchronize my other watches to. I don't think distance is a factor in synching but I don't know how well it would cope with intervening terrain (mountains). I'm guessing that the signal bounces off the ionosphere so that probably doesn't matter either.
Mine hasn't been a problem watch in any way. There are a few quirks with the design. It does not display leading zeros on the minutes which is different than what you're used to (kind of unique and you get used to it). To set the date, you need to set current week number, which is a bit unusual and awkward, however, you only need to do that once. It also lets you adjust the contrast of the display, which is kind of nice. The back light is a nice cool blue color and is just the right brightness, so that's another functional nicety.
The display is hyper-readable - large digits and very contrasty. I also like the asymmetric design. I have the model with a positive (grey background) LCD over a stainless steel case and bracelet, which I think looks quite nice. It's a bit smaller than the Venturas (I have a Spark Rx) too but not too small, so it's quite wearable. I'm glad that the crystal is sapphire since it goes right to the edge of the case - it should be durable enough (although I don't abuse watches so I can't really say). It's mostly brushed (which I like) with just a few polished areas. Thankfully, there are no printed words or branding (other than the Junghans name) on the display or the case so the design is kept nicely minimalist. I can't really think of any reason not to recommend it. It's a little boxy and perhaps not quite as futuristic or sexy as a Ventura Sigma, but it's a very nice watch that nicely balances features, style and usability.
-abe.