I traded a Scrambler for the G5.
I have found that the Bullet doesn't require quite as much maintenance as the Thruxton. We don't have to adjust valves! Oil changes and chain adjustments is all there is. When it's new, you need togo over the nuts and bolts on it and make sure everything is tight. During breakin in, it shakes a bit more than after it's broken in, and things can tend to fall off! Ger some Blue Loctite and use it liberally! That'll give you a real chance to see how everything is put together. As far as cruising goes, I like to keep mine at between 60 and 65 true ground speed, mostly because the mileage starts dropping off a lot when I go faster. My riding partner (6'4" and 230) and I regularly ride 250-350 miles though the mountains of SoCal, From sea level to over 8000' elevation, using the freeways to connect them all together. We both have over 10,000 miles on the bikes with no real problems. We've never broken down out on the road. The Bullet gives more smiles/mile than any bike I've ever owned.
As a group, we tend to fiddle with a lot of things on the bikes, but nothing is mandatory. The reason for the fiddling is that everything is right at hand with nothing hard to reach. It's far easier to work on then even the Thruxton.
I found the Scrambler a PITA to work on because of the high pipes, and everything was too tight. I don't miss the Scrambler a bit. I put 17,000 miles on it in 5 years. I never likes it very well. I had to other Hinckley Triumphs before it, a 95 Speed Triple, and a 2000 Sprint RS. Those two were great bikes. They were both ridden about 50,000 miles.