The HTML export is poor at best. It does not transfer the relevant information that I have in the system.
I have project on Hold, projects that are in folders, Lists, etc...
But the export does not give me that flexibility.
Unfortunately I have fulled around with all these things and unfortunately my productivity is just spiraling down instead of up because I am playing with the system instead of doing tasks.
I can recommend that if you want to partner with a good Android development team with a GTD product already there, and under NDA provide all the information and advise to them to be able to take the data from the Webdav server.
I contacted what I consider the best GTD program on the Android (DGT GTD) and there is some interest in creating a sync. The person has a number of sync's already in place with Toodedo and others, if he has the information I am sure that he can charge for the SYNC and at the same time you can make the rest of your customers happy.
I understand that you have no desire to create such a program, but at the same time you might want to explore alternatives so that you do not loose customers to the other GTD programs.
Unfortunately I switched to one of your competitors after watching my productivity go down tremendously. I would be glad to return, but an Android version or sync of some kind is a MUST for me now after getting the Galaxy Note 2 (Phone / Mini Tablet).