Interesting, I was also about to hit the "buy now" button, one on eBay ATM for £150 would be interested to see the quality of it.
The only thing that puts me off a 4-2-1 is the fact there is no flexi joint, and I can just see the hassle of tKi g the whole thing back off in 6months to have it rewelded....
Keep us posted on what you get up to with this