I take it you mean the
MLX770 system? This is very expensive, unless you already have a suitable big MFD in which case it is only a few k to install the Iridium satellite modem, the rooftop aerial, and the rest. Their radar data appears to come from meteox.com whose coverage is just N Europe.
The other, similarly expensive system, is
MT. They use Iridium too.
The problem is that Iridium charge about $4/minute for dial-up data and this gives you just 2.4kbits/sec. OK for METARs etc but will always be pricey for radar images.
I have this working with a Thuraya SG-2520 sat phone and any windoze-running display device. Was pretty handy on a trip last weekend, too. The phone is about £500 and the "GPRS" data costs US$5/MB which is absolutely peanuts. At ~ 50kbts/sec it's also much faster. I have the details if anybody needs them.