I had the privilege of travelling on the Coastliner 840 from Pickering to Whitby yesterday, with a Wright Gemini 2 B9 outwards and a Wright Gemini 3 B5TL on the return. Thought that might be worthy of a comparison.
The Gemini 2 was a good solid ride throughout though a little claustrophobic. It handled the climbs ok as I knew it would, especially the climb out of Goathland.
I was more interested in how the smaller, less powerful B5TL would handle the hills. Well, it climbed out of Whitby no problem. Blue Bank out of Sleights is a gruelling climb for any vehicle being a long 1:5. The driver handled the climb well, when reaching the steepest point by allowing the revs to drop and it dropping from 2nd to 1st and we then made our way reasonably well.
At Goathland, the real true comparison as the double run is the same for all journeys. It's a 1:4 out of the village and the B5 slipped into crawler (as had the B9) and handled that hill with no problem. Same with the climb at Saltergate, which it fairly flew up.
There does seem to be an obsession with enthusiasts about "power" but the fact is that modern vehicles can kick out as much as required with a smaller engine; the issues that some vehicles have is more in the set up (how the gearbox is mapped etc) rather than the inherent vehicle type.
I'd also mention that the Eclipse 3 had skylights which were a bit of a mixed blessing. Was getting quite warm but that and the absence of grab poles make it less claustrophobic than the Eclipse 2 despite the smaller windows. When sat on the bus (which is the important bit, not standing outside looking at the thing), you don't notice the window size and it's not like peering out like a tank commander!
Have to say the legroom on the Gemini 3 was also very generous; I'm a bit of a short ar5e but even someone 6'6 would be fine I would suggest!