I occasionally shoot a 709. It was having feed issues. We called Taurus, they said "send it in". We suggested it was a magazine issue. They said OK and mailed out a new mag.
No issues since then.
The spring on the new mag is a little longer than the original.
Got no problems with them. Based on my experience their customer service was very good.
"your mileage may vary"
"Got a shotgun, a rifle and a four wheel drive" - HW Jr.
BSA Eagle Scout