DIvesoft.
Add SPG to Divesoft Trimix analyzer?
Absolutely no regrets. Buy once, cry once, as they say. Setup this way, I really don't think any analyzer could be easier to use.
I really don't like the Analox trimix analyzer much. A buddy has one which I used a number of times before getting my Divesoft. My main beef is the calibration. The O2 calibration knob is just too easy to accidentally bump. And, it does not auto-compensate for temperature like the Divesoft does. Also, the Divesoft supports 1, 2, and 3-point calibration, if you want to do it. The Analox is single point each for O2 and He.
With all the fixin's the Divesoft is more expensive, I think. I got mine before the Solo came out, so I'm not sure how the Solo compares, pricewise. But, I do think it's worth it.
I also especially like having and using the flow limiter setup that I have. I have a few tanks with valves that are a real pain to get to flow the right amount for the little Analox-style dome thingie. I crack the valve open and 5 seconds later the flow has tapered down and then stopped. With the Pro flow limiter on my Divesoft, it's so easy. Just crank the valve open and let it go. No worries of wasting a bunch of gas and getting a reading that is off by having the flow to high. No worries of blowing out an O2 sensor from too much flow (a buddy did that to the sensor in my Analox O2 analyzer). And, with my setup, no separate step to check the tank pressure. I check the tank pressure and get a free gas analysis at the same time.