The pro of using this last beta, 1.4.5.1 is that it is very much usable, and it is what DSI believes to be final. The more that use it, the more chances we can assure it is ship-tight.
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Ignore the controversy. My opinion is the water is warm enough. Is there something you need that is available in 1.4 and not in the last beta, 1.4.5.1? If so, is it available in some other post 1.4 beta?
I had a MIDI DIN issue in 1.4 and in 1.4.3beta. I had a file management issue in 1.4.3beta. I had some other UI quirky things in 1.4.3beta.
So far, in my very limited use of 1.4.5.1, it seems solid for basic sequencing, Playlist creation, and SPP matters in DAW-syncing via USB. And I haven't observed the quirky UI things I had seen in 1.4.3beta yet.