I love mine. I own a TALO G19, bought it the week they were released.
Don't buy it for collectibility, buy it because you like it. Between buying a new Glock and then having the barrel jeweled, and a custom slide finish (which no one can seem to do this exact finish anyway) you'd spend about $800.
Mine cost me $700 or $750, whetever the list price was when they were released. So to see it drop so steeply, so quickly... that should show you it is not an investment.
I won't ever part with mine. Damn nicest looking Glock out there.