I had a VX-1, returned it about a week after I got it. Nothing wrong with the unit, just didn’t like the zoom feature. Picked up a Humminbird Ice 55 in 2009 and loved it. In fact, I still have it. The target separation leaves something to be desired, but the big, bright screen was awesome. I also had one of the first Showdown units (picked it up cheap when Sportsman’s Warehouse closed), I sold it almost immediately for numerous software issues and interference. Not to mention the power cables on the first ones were problematic. I have heard the new Showdown units have really improved, however. I recently picked up an FLX-28 and wow, best unit I’ve had by far. I also have a Humminbird Helix Ice. If I didn’t solely purchase that unit to replace an H20 for GPS, it would be for sale already. It is tough to read and overall slow on feedback. The Helix units deserve to stay on boats, IMO.
At the end of the day, each unit, regardless of brand will have its pros and cons. Find the one you like best and it will serve you well.