Dave, regarding LV's active status and support response, I just conversed with their support today. I submitted an email through their Technical Support page on their website and received a response in less than two hours. In fact, every conversation I've had with them has been pleasant, professional, and quickly returned.
I was in a slightly similar situation as yours when looking for a dive computer. My son is my diving buddy and we're both pretty new (< 20 dives so far but working on it this summer). Locally, we dive a pretty murky lake with 10-15' viz on good days. I wanted a computer I could read in the murk without having to hit a backlight button and even with a backlight, my eyesight really gave me trouble trying to read a normal mono LCD screen. I also wanted AI and liked the idea of being able to see both my and my son's remaining air.
So, I bought two used Lynx computers with transmitters from the for sale postings here on Scubaboard. I got both setups, including one data transfer box and one rechargeable kit, for less than the cost of a single new computer & transmitter (and not MSRP - actual web/street pricing).
I registered them with LV's website and got a response acknowledging it immediately. One of the pair didn't come with a rubber donut that's required to use a rechargeable battery in the transmitter so I emailed them asking how to buy one. Even though they knew I had purchased it used, they sent me one FREE for only the cost of shipping (granted, shipping was $18 since it was from Canada to the US but that's not their fault.)
Their website is a little outdated and there are links there and in the manual that no longer work. I admit that made me wonder if I had just bought two paperweights when I first started trying to setup the computers but I think that can be attributed to uncertainty from the transition that's going on with them being bought by Huish. After contacting them several times, I no longer doubt their willingness to support their products.
I've only got two dives on the computers but so far I really like them. The compass is a little difficult to work with but I'm sure I'll figure it out with practice. I don't notice the ultrasound pinging when underwater although I can hear it above water (one of them is noticeably "louder" than the other). The AI has worked flawlessly for both me and my dive buddy. I've yet to try the locator feature. My only "big" complaint is that their dive log software really needs to be updated. It's also not supported by subsurface. You can view depth and temperature charts directly on the computer so there's always that option.
Most of the complaints I read about them when researching before buying were about the expensive batteries and battery life. If you use their disposable batteries, you'll get longer battery life but they're pretty esoteric, hard to find, and in truth expensive. But, there is a rechargeable option so I just bought another 3 sets of rechargeable batteries and plan to swap them daily. You can buy the rechargeables and a charging kit directly from the battery manufacturer for about half the price of the LV-branded equivalents (PM me if you want the battery supplier URL.)
Like I said, I only have two dives with them so far but I'd be happy to answer any other questions about them that I can. All in all, I'm pleased with my purchases.