Shower Drain replacement - Wingtite?

Hi everyone!
Has anyone ever tried to install the Wingtite shower drain (see the web page at I have a plastic/fiberglass corner shower stall on the second floor. The drain was leaking, and I removed it (perhaps a little too ambitious) down to the 2" abs drain riser. I have tongue in groove wood panelling on the floor below, so I don't want to cut into my ceiling. The wingtite drain says it can be installed from the top down (which is ideal).
Have you used it? Success/failure?
Easy to install? No leaks?
Any help is appreciated! All the literature on the net is produced by the company!
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