Well, that's a week of using Jegger as a daily and I've loved it. It's shuttled the kids about happily (they love it), gone shopping, short trips and commuting and not really been any bother. I also got 190 miles out of £30 of expensive fuel with me driving pretty hard most of the time. It's restored my faith in Jegger and reignited my interest in fixing the faults.
Ah yes, the faults.... So the airbag light goes on if you move the seats but then goes out again the next day, so I'm happy with that.
The suspension is still harsh but hasn't really bothered me that much (I'm still putting standard springs on though).
The gearbox is now an even bigger pig. Changes into fifth now take 5-6 tries and sometimes you just have to give up. However, I discovered today that if you pause for two seconds after dipping the clutch and then go for the gear, the hit rate is higher (I'm still changing it).
So the upshot is that Jegger's going up on axle stands this weekend and I'll slowly start dismantling the suspension and the removing the gearbox. Then I'll have a look at what I need to replace (I'm not replacing the clutch if it only has a tiny bit of wear as I think it was done very soon before I bought Jegger). I will do the clutch slave cylinder and the release bearing regardless though. The replacement gearbox has already been cleaned up so it just needs me to pull my finger out!