Shotshell Gauge Adapters

[Duffy]

Has anyone ever used any shotshell gauge adapters like this...

http://www.gaugemate.com/silver.htm

or this...

http://www.firequest.com/HV410.html ?

If so, do they work well? Any problems?

I am thinking if buying a few to get my daughters up and running on shooting clay. I would use the .410 to 12 ga. adapters at first, upgrade to 20 ga. to 12 ga. later, and so on. If they want to continue shooting, I'll eventually get them their own shotguns.

Any input on these adapters would be appreciated. Thanks.