My wife has a Nuvi 200 and I have a TT 720. I got the TT since maps of Australia and NZ are erm cheaper. We just used the 720 on a trip down there for a couple of weeks and it really did well.
On the way to Chicago O'Hare Airport we ran both side by side compared the differences. I won't look at things like Bluetooth and such since the Nuvi 200 is the lowest of the low and the 720 isn't.
I have moded the 720 by adding the 920 POI database.
Where the Nuvi 200 did better:
- ETA is right/close. (Tomtom was 1 hour wrong on a 2 hour trip)
- WAY better POI database. (even compared to the 920 poi database)
- Zooms out with more detail.
- Routing picks better/faster routes.
- Two clicks to reroute around a road block.
- Let's you know when you missed a turn audibly, it says "Recalculating".
Where the Nuvi 200 performed poorly compared to the TT:
- Going underground then back to the surface can really send it for a loop when it gets sat lock back.
- Slow at looking up POIs
- Less features in general, like the ability to find alternate routes, etc.
- The TT tells you to take express lanes on the Dan Ryan Expressway in Chicago. Good since I don't know I need a local vs express, but since some of the express lanes aren't always open since they change direction based on the time of day it gets a little confused sometimes.
Looking for addresses on the 720 when you don't know the exact city seems fine. If you do a search on a close city, then street name I have seen it frequently show a the street name followed by the town it's really in. For example in Brisbane, AU when you put the city as Brisbane, then search for Chapel Hill Rd, it shows you Chapel Hill Rd something like this:
Chapel Hill Rd
Chapel Hill Rd (Chapel Hill)
Chapel Hill Rd (Mogil)
Where the name in parentheses is the actual city name.
The Au and NZ maps were fine in town. When we started going to some pretty remote locations in Western New Zealand the maps started to have roads in the wrong place. Like the highway at once point jumped about 300m to one side and over the next 5km worked it's way back.
The Australian POI database is missing an odd set of major chains. For example it doesn't have Woolwolths (or maybe it was Coles, anyways a major grocery store) under grocery or anywhere, but it has Woolworths Express which is a gas station corner store listed.