I own a 710 and have had good success w/ it. I use the tool that is included. Sometimes I will directly drop a dab on the coil, but usually not. Usually, I will load a piece w/ the tool into the bottom of the funnel. I then take the tool and jam it down through the hole next to the coil. At this point I will heat up the coil, which in turn heats up the tool - making it easier to manipulate the material in the funnel.
I have filled the funnel up about 1/8" to a 1/4" w/ good success. Sometimes it will get clogged, but a really strong pull while heating will create an air pocket and allow normal use.
I tried cleaning w/ pipe cleaners and iso, but the pipe cleaners left little 'hair' everywhere. Now I just use iso and toothpicks/skewers. I have soaked my oven in iso to clean/restore w/ good success, but don't know if it's recommended. I like how the cart disassembles for easy cleaning.
The only real prob w/ this thing that I've had is the weak connection on the base where the batt connects/is wired into the power button. Sometimes this would come apart in my pocket. I added a couple drops of adhesive, resealed and never had more issues.
I would still like to know what batt this is for cheaper replacement options.