I used to have a Dell Precision M4800 and honestly you don't buy them for battery life. They're desktop workstation replacements that you haul off to meetings occasionally. I got about 2-3 hours of battery time on that thing when running usual work-related workloads on it... (IDE, VM's etc.). I don't remember the noise, but I'm not very sensitive to noisy laptops so I may have never noticed.
I miss that laptop. The build quality was through the roof and it was solid as a brick.
The new Precisions are a lot less Desktop workstation replacements and more power efficient. I wonder if they still offer the same kind of performance though.
> I wonder if they still offer the same kind of performance though
Base clock speed is down a tick (2.7ghz vs. 2.8ghz) compared to previous generation Intel chips in the M4700/M4800 line vs. the new Precision 5510. Same 8M cpu cache; presumably newer intel chips are more efficient and make up for performance difference elsewhere (e.g. less heat = less cpu throttling during intensive tasks).
Sitting on the fence here, waiting to see if Intel's next line of mobile CPUs bring significant performance improvements. Current setup (M4700, i7 extreme, 2 X SSD, 32GB) is awesome modulo the battery life, which is about 2 hours for minimal workloads.
I miss that laptop. The build quality was through the roof and it was solid as a brick.