I can't add much. The 44 Mag '73 has intrigued me but not to the point I purchased one. I did correspond with two users, one here in the US and another in Australia. Both were quite fond of their rifle and reported it was more accurate than most.
I saw a web post by another owner that 44 Special brass didn't like the rifle, but 44 Mag brass was fine with it.
I've read Uberti stopped making them in 2020, but until last month Taylor's site listed it as in stock. That one must have been sold, for they are now listed as back ordered.
Some claim the receiver and links are special steels, but the factory site lists the same part numbers for the 44 Mag and 44 WCF, although I don't know how accurate is the factory site.
Do let us know how it shoots. I kind of regret not trying one. Instead I bought a restored original '73 in 38-40. It has poor balance compared to a carbine and the action is too stiff for my tastes. I think it will be sold off and replaced by a '73 or '66 carbine replica.