I'm an owner of the Motorola Atrix 4g since a month, and an owner of the Samsung P1000 Galaxy Tab w/ CM7 since the dawn of human generation :P, and from my experience with both of these droids, I can say strictly that the GPS quality on both of them is a no match for the N900. Don't forget that the ATRIX and the Tab are in the list of symbolic Android devices too.

If network positioning is off in my N900, I can get an excellent GPS lock withing 2-3 minutes if I'm in a clear place, and 4-6 minutes if I'm in the busy streets of my city. If network positioning is enabled, I get a GPS lock instantly, a matter of seconds. This is far the fastest rank of mobile-GPS-signal-acquiring I've ever experienced.

While on my ATRIX, GPS quality is great, once you get a lock. Yes, you can get a lock 5 satellites indoors but most (if not all) Androids require data transfer (internet) in order to get proper GPS signal. I've never seemed yo be able to get a lock on GPS if I'm offline.

I've owned an N97, which had a hardware problem on the GPS receivers so, hopeless!

What is the secret? Is the GPS-related software in Maemo 5 optimised to use every single bit on the N900's GPS module? This maybe the reason because there is only one Maemo 5 device, while there are thousands of Android models which can't necessarily have an optimised software for all different models...
It's a shame NOKIA didn't release proper Mapping and Navigation software for Maemo 5, but I'm looking forward to experiencing the "Drive" on Maemo 6/harmattan on the NOKIA N9.