The non-compensating euphs are okay, and they'll last a while. Ours are around 5-6 years old. The finish is starting to come off a couple of them, but otherwise they play okay.
Just be aware that the valves seize if you don't oil them or use them for a week or so.
The compensating model isn't really worth it. For the same reasons as above, the valves are an issue.
With that said I'm about to buy two Yamaha euphs after having the Tuba Exchange models for that time frame.