Tbh, I usually follow @Olias lead. In particular on IT matters. That was also the case on the 01.09. upgrade.
Until there was a particular test series I wanted to do (Minimum Layer Height Limbo: How low can we go?) which Studio is unable to accomodate (“combine infill” does not work adequately in Studio, only in Orca), I had little time.but multiple issues between Sd card prob’s, firmware updates, Studio, … all combined with a lack of own IT expertise.
So I bit the lemon and ran the gauntlet.
It worked exactly as advertised.
But, and I think this may be pretty.important, I have no idea how I would go about reverting back to a pre-01.09. version without Bambu Connect… I expect that could be quite a chore…
Personally, I am not too worried about Bambu locking down filaments. It’d require a really stable supply chain with only very short and limied lack of material stocks possible and eliminate their own procurement flexibility. So I expect that it’ll not happen before they feel that they have well and truly saturated and dominated the market. I expect there’s still plenty of room.
What I am however worried about is being locked into a data stream that could be impeded by measures beyond my (or Bambu’s) control. It does not even need to be a world changing event. Just an economic downturn, a little bad luck, … would I still be able to print if Bambu is not able to update Studio, Connect, etc? Certainly for a while, but equall certainly: not indefinitely.
I probably would have tried harder not to need to upgrade if I did not have a Plus 4 sitting opposite the X1C 
. Its Qidi Box (aka: AMS) should have touched down in Frankfurt earlier today 
.