Yes it should be fantastic. I have the Xperia 10iii and it's a great phone. The 10V has better camera's and OIS as well as a newer processor and bigger battery, so it should be great for most people.
I get 2 day battery life on mine which has a 4500mAh battery, so the 10V with the 5000mAh battery should go even longer....
i always hear about how good new phone batteries are... but i think im just such a "power user" that i never get a full days battery life. always browsing the web, taking pictures, watching youtube, playing games.
I've gone through 4 phones, each time saying "well, clearly my old battery was bad since it died so quickly, im sure my new... will be better" and each time its roughly the same.
Looks really promising. I'm glad they kept the headphone jack, I use mine all the time. OIS and the improved point-and-shoot camera are big selling points. I also appreciate the attention to details like its classic design (no notch or pinhole!) and plastic-free packaging.