No experience of this sort of tracker, but I find a tracker really useful. Yes, it might help find a stolen van, but that's unlikely to be needed.
I find the tracker useful for retracing past adventures, for finding it when parked in unfamiliar towns, for knowing what's happening when it's in for service, or just being reassured thst ot's still where I parked it.
However, the cost makes a difference. My trackers cost about £30 each to buy, plus a server subscription (£1 per month) and a sim card subscription (I got mine for a one-off £5, but nowadays allow for £5 to £10 per year).
You get a web login to track, or can use a free app on a phone.
The ones that report their position by SMS are a bit useless and the free tracker servers don't keep past records long enough.