I'm sorry to say that the latest design doesn't look worth the effort, it's not enough of a change for my liking. Unfortunately I didn't see the Vers 3 so can't comment on that one but I do think that the app & the web site need a fairly radical change to the UI. Functionally, both are good, but there is a lot that could be done to improve the inputs and also make viewing them less of a strain.
I have used the web in both 'lite & pro' modes, but input lags way behind others of this ilk. I don't use the app at the moment as i just can't get on with the UI. I prefer the 2Do app, which I then sync with the web site. I would rather use Toodledo on both though. I shall wait to see what changes the team come up with & if the interface is significantly improved I will gadlly reinstall the app.
I would also like to see which projects each task is associated with much more easily than present. Again, look at 2Do and they colour code your projects making it much easier to see at a glance.