They are nice little handy guns. Originally designed to be used by support personnel and officers-not front line battle operations in WWII. The main front line rifle was the M1 Grand which fired the very powerful .30-06 round. The M1-Carbine utilizes the M1 Carbine .30 cal round. This round is essentially a pistol round. The pros of the M1-Carbine are: 1) Light weigh, 2) compact 3) you can get a 30 round magazine for this rifle, 4) Original ones are very collectable (there were about 10 manufactures from WWII with some of the most desired by collectors being the ones made at the Rockola Juke Box company. Other manufactures were: General Motors, IBM, Winchester and others..
Cons of the rifle are 1) The pistol round lacks range 2)The pistol round lacks stopping power on very large game an humans with heavy coats as reported from those who used the rifle in Korea going against heavy coated Chinese during the battle of Chosen Reservoir.
Overall if you have any appreciation of American history. I would get one-if nothing more than just to look at and hold a piece of American history (much like tractor collecting)