I only shot the long range matches.
I found that the SMT system in general worked well, and in fact after shooting the the match, I feel it's the future and greatly prefer it over the traditional paper targets (even if I didn't have to pull targets myself).
My only real complaint was the Lenovo tablets used, at times I got the big red X when shooting or scoring, extremely frustrating and it disrupts your rhythm. Something about them just didn't play nice with the WiFi.
Once I was allowed to use my own personal iPad it was much better, which did not disconnect once (heck even my iPhone didn't disconnect once when I used it).
There was some minor niggles with the web page updating and resetting my carefully set up zoom level, etc. but it wasn't a big deal.
Another thing I liked about my iPad was that it was a 4:3 display instead of the 16:9 or 16:10 of the Lenovo (and most Android tablets), it was a better use of the screen area to look at the actual target itself.
Operationally, the ETs can greatly increase the capacity of a range and make the match run much faster, but the rules haven't caught up (and I understand that there would resistance to changing those rules too much).
I noticed at Lodi that there was a lot of standing around, where most every target finished fairly quickly and everyone waited for those couple of targets that took the whole 195 minutes.
If you queue up shooters like in a checkout line at a big box store (e.g. for 30 targets, start the first 30 people, once one shooter finishes next shooter in line takes his place, and so on, with your place in line being determined by your score and/or classification, or however), you could probably significantly cut down the time used, or increase capacity for the same amount of time it currently takes.
In this system, there would much less chance of bottlenecks where, for example everybody finishes except that few targets where everyone takes their full 33 minute block time (and thus the total 195 minutes), those shooters would be more likely to be evenly distributed throughout the line so that that the total time need for all the shooters on any given target likely decreases.
The only time this would break down is if eveyone in fact used all or most of their 33 minutes, but in that case you'd be no worse off than the current system.
You can do this either for the whole day's shooting (3 matches), which would require a rule change but which would yield the most time savings, but even within a single match this would make things go along quicker, and probably significantly reduce the actual total time required for everyone to shoot in a single match, without denying everyone their option to use their full 33 minutes.