I may just not be power hungry, but I've never felt that 400 hp isn't enough in this car. It's definitely not as much violent thrust as say, a Hurcan or a 991 Turbo, but it's certainly plenty as far as I'm concerned. I generally enjoy the character of an engine than the ultimate power numbers. The 4.3 has alot of personality.
As for maintenance, they are very solid, well built cars. They have few design faults and are generally pretty reliable. They go through tires pretty fast and the stock clutch can be hard to master and wears quickly. I had a 986 Boxster S for a long time and it was alot more temperamental than the Vantage.
What year is yours, what year did they go to the 4.7. Engine size does not make it less lazy. Gearing flywheel and tune are all bigger factors.
Agreed 400hp is plenty for road car.
Maintanace, I have a ferarri 512BB so am somewhat inured to the term maintanance, and the exige v6 track car eats tires and brakes like there is no tomorrow. What goes wrong on the Aston, whats the yearly upkeep require, any big expenses over the years, excluding tires. If one owned the car for say 10 years what would you estimate the average yearly maintance bill would be, and what big expenses occur here and there over the years. Ie what goes wrong on these.