Remember that gliders are either in a thermal going up or looking for the next one while going down; so, no quadrantial altitudes.
In Canada, many (not all) of the VFR SEPs tend to be at +500 and the big iron is usually at a 000. In NA, the transition altitude is 18,000' and there is no QFE; so, we do tend to have everybody on the same altimeter setting
So I try to remember to be especially alert for fast moving metal at 000s and 500s while slower moving fibreglass can be coming from anywhere, but is mostly found under good looking cumulus.
The provincial medivac is especially good at announcing itself on the local freqs