I have a Tomtom 140s. It is the smaller type -- 3.5 inches. I had the larger one but it was just too bulky and unnecessary, so I sold that to a friend. The 140s has IQ Routes, spoken street names, Advanced Lane Guidance. The IQ Routes means that it takes into effect traditional traffic patterns in areas, especially cities, to get you to take the fastest possible route.
I have used GPS's for years, almost every brand, and I have to say Tomtoms are the best, IMHO. The ability to do things like remove roads that are no longer there or washed out is invaluable. There's an important bridge near here that is permanently out of service. When I had a Garmin (brand new with the latest maps), I couldn't remove it from the GPS, so you'd have to examine the route to see if the bridge was in the manifest and then click on detour many times to find another route without that bridge. Or guess and start driving in another direction to see if it would reroute around the bridge, but then it may have been better to head in the other direction. Sounds like not a big deal, but it matters. It's just not clean and easy. But with the Tomtom, I simply clicked "revise map" and highlighted the bridge and marked it inaccessible.
And the Tomtom user interface is more logical and easier to use. The Garmin's is kind of muddled and not as intuitive. I've also used Magellans and Rightways and Nextar. None have matched Tomtom. In a job I had for 2 years, I had to do a lot of driving to customer's houses, and 99.9% of the time, the Tomtom got me to their front door. Hardly ever had to look at a map or consult Google Maps.
I had a Tomtom 130 that my company gave us 4 years ago, then I bought a brand new Garmin but was not impressed, so I picked up a 140s 2 years ago. I was out visiting my parents, and they loved the spoken street feature, so I let them keep it, and I took their 130 in exchange, but then I bought another 140s.