Things didn't go so smoothly when I installed a 440 in place of a 430w. The 430w had great satellite lock, the 440 kept loosing satellite lock. Same tray, same gps antenna, the 430 held position, the 440 lost position every few minutes it seemed. I pulled the 440 out, put the 430w back, issue was completely gone; I pulled the 430w out put the 440 back, gps lock kept recurring.
The other issue, or concern I had, was the 440 ran hot. It was so hot it was uncomfortable to touch. I really wanted to like the 440. It offers much more capability than the 430w. Ultimately I removed the 440. I ran the 430w until a month or two ago when I installed a GTN650xi.
At the current price point of a 430w, they will likely remain viable until mechanical failures lead to attrition.