I've never been offered a Glock switch, I feel so left out.
They were cheap (like $5-10US) when I was in the Philippines since they were sold for the airsoft guns; a lot of the overseas airsoft guns are the same internally as their real counterparts. I've put a couple of mags through real Glocks with them at one of the ranges there just because but without some sort of chassis system and a rate reducer and muzzle brake or suppressor I doubt I'd buy one even if they were sold over the counter at PSA. Kind of like the first time I fired a real MAC in .380- burp, burp. "Gun's jammed", "Nope, it's empty". You could practically see the dollar marks coming out the side.
Get the rate down to around 650 or so and they'd be a lot more useful in my opinion (other than just bringing a smile to your face which is of course also a perfectly valid reason to own any gun in my book)
That said, I still kick myself for not buying that Shrike upper PSA had on the top shelf at their original store for so long that they'd dropped the price. That and a FRT/binary trigger would be a lot more fun.