The GPS/Navigation software. Factory navigation, Unavi 7500/x1/x2 by default use Speednavi, which is a horrible piece of junk.
IGO is by far the best GPS platform out there for Windows CE devices.
Routing is good, maps are updated atleast twice a year, etc.
I'd highly suggest avoiding any SpeedNavi software based GPS like a woman with the STDs
Here's a basic video showing it:
https://www.youtube.com/watch?v=BuFBKiBbOVY
Long story short, Unavi switched the X1/X2 to MIPS processors after the 7500 because they are far cheaper (many companies liquidate them as the market (programs) shifted to ARM based units).
SpeedNavi already had a MIPS program out, so it was an easily solution for Unavi to cut costs and increase profit. They continued to use ARM based units in Korea because ALL the other Unavi-esque products (Imercury, Finedrive, Hyundai DLS, etc.) used ARM processors, and most of the GPS software in Korea also uses ARM.
Unavi felt the errors of their way in North America due to losing substantial market share to Compass-NAV (Imercury branded in North America), which offered IGO, and switched the new model (X5/X6) to a ARM processor.
In fact, the Unavi X5 is just a rebranded Hyundai HDLS Z83 (
http://hdls.co.kr/). To give you an idea on the mark up through Unavi, the Z83 in Korea is roughly 400$ USD after conversion. Figure another 80$ for a dash bezel and their (Esense) custom trip module couldn't cost more than 50$, so you are $530. Their average markup is about 100% over their cost. Sure you get a 1 or 3 year warranty, but realistically if the main unit fails, your 100% cost increase has essentially covered the replacement once.
All supporting hardware (trip module, wire harness), etc. between the X1/X2 and X5/X6 are identical, and the trip program itself is the same (including the same bugs...) just recompiled to utilize the different serial port assignment on the unit between models, and recompiled for ARM versus MIPS.
You can dig into it deeper and probably determine that they, in turn, send the core back to HDLS under a vendor warranty, and get their money back - but I suppose their profitability and business practices aren't really relevant to your interest
There's another lesser known company here (making a big name in Mexico, slowly into US/CAN) called Navitech - they also use rebranded HDLS units and sell them on Ebay for 799 or 899$ I believe.
Unfortunately, Imercury/CompassNAV don't make a Genesis Coupe specific unit for North America - marketshare is way too low compared to Sonata, Optima, etc.
I've imported a FineDrive unit from Korea for ~500$, with the trip module, etc. Reskinned it to English, loaded up IGO, and live with the "radio display" not showing XM, which my subscription has lapsed anyways.
On a side note, according to my resources, Unavi is effectively dead in Korea due to not keeping up with the evolving marketplace (dual core 1.8ghz winCE platforms, etc).- they are still in NA because, apparently, profit margins are much higher and competing products aren't nearly a "dime a dozen" here like they are in Korea.