I've shot one of the crickets and they are darn handy little rifles. I've considered even buying one for myself as a truck/hiking rifle. Off the bench it's horribly awkward shooting something that short, but off hand they don't weigh anything and point wonderfully.
The other advantage of a single shot is you can control the flow of ammo during a shooting session. The way my dad beat safe gun handling in my head was he'd hold up a bullet and ask me the 4 rules of gun safety.
After I repeated them back to him, he'd give me the round and I'd shoot it. Next round, same thing. Or he'd ask me what "BRAS" means, or what correct sight picture is, stuff along those lines.
It was always a little quiz to get me to know all of the fundamentals.
It also helped as we started working on longer ranges. He'd have me get a sight picture and tell hm where I was going to aim- then he'd give me the round and I'd take the shot.
Sometimes he'd also ask me to call my shot after I took it, and as a pair he knew where i was aiming and where i was hitting and could coach me on to target.