My take is that the T-1275 is perhaps a little bit acid starved. It prefers low and slow near the top charge portion. It takes a day for the Specific gravity to pop up after an EQ session if you can get it to 16V.
I had to do 3 or 4 equalize sessions over maybe 10 days to finally get my abused battery to pop the SG up on the weak cell and get it in spec, and I seem to recall it finally happened on a hot summer day, like 95F + that day to get all the sulfur off. So, in a sense, it was stubborn.
My observation is not to abuse it, don't get the battery below 60% SOC, and it's a professional grade battery that requires professional recharging care daily to get it topped off, not 90%, nor 95%, or 98. I find an hour late in the day to 15.0V if on a small solar panel gets it down to about 4 ah from 9.5 to 9 when it will take all my 150W panel will put out. If I do this daily on a 14 day trip, it will not take much of an EQ charge, time wise, to have it desulfated and ready for storage. Mine are rather gassy, but I don't seem to be losing water much at all... champagne bubbles on 14.8V, a bit faster, about same size at 15.0V. Stirred, and that's what it takes to get fresh electrolyte near the plates that can take the sulfur off of them. It is a slow process, for the last few percentage points of fully charged on these.
YMMV, find out what works for you. Stay on top of that weak sister cell. I may give up a little life pushing mine to 15.0V for 30 minutes to an hour daily, or maybe not... I don'f full time, I want my battery in tip top shape before going into storage fully disconnected.
Is it a good battery for me? You bet. Is it a little fussy? You bet. Will it last? Mine has an H1 build date, and was worked hard on a golf course for at least 1.5 years here in So Cal, where they golf year round, weather wise.
Probably a good fit for you, if as Mex says, you figure it out quickly, what makes it tick, and what keeps it happy, baby sitting wise. It will need a bit of baby sitting, IMHO... not for everyone, like a T-105. The T-105 charges easily, efficiently, and needs not much care for long life. I think a T-1275 is a different animal. A little more quirky, and a little more stubborn to get the last few points of top charge into it.
