Garmin 530 - your thoughts

Hi

I'm considering buying Garmin 530 as the battery life is my 4 years old Garmin 520 is very poor now (approx. 3.5h), when my endurance rides are relatively long -  5h+
What are your thoughts/experience with 530 model? 
I'm using a power meter and speed sensor over ANT+ connection and obviously BT for my mobile phone.

Regards

Pete