i have one. I only ever us it for small stuff though. I find it still allows shifts in the fabric, I use spray basting and the fusible batting and like it better. But the basting gun did come in handy at valentines day. I made labels and attached them with that thing to bags of goldfish for my son's daycare class

I have had a couple of different ones...
No more. I have had them break or get stuck in the needle too many times.
I think the 505 is a great product...just remember to use in a ventilated room.