The general consensus is that you'll have an easier ride on a full suspension bike, simply because it'll take some of the trail chatter out and therefore you'll finish feeling a bit fresher.
I can't compare from experience though, as I've only ever ridden it on a hardtail (1995 Explosif) and rigid (1988 Explosif). My times (around the 4hr mark) were about the same on both but the '95 Explosif gave me an easier ride.
Bear in mind that I'm an old fart and my back doesn't like miles of in-the -saddle type stuff on forestry tracks. Your back might not mind.....
Fit some fast rolling tyres as the first 14 miles (Point of Ayre to Ballaugh) is all tarmac - don't hammer on too much on the road and knacker yourself before the first off-road climb to 1,350, ft but you still need to keep as far to the front of the entry as you think that you are able - get with a group at the pace that you need and then you can all take it in turns to do a pull on the front. The last thing that you want is to be left on the coast road on your own, especially if there's a SW wind (which is what's most likely). Mind you, the entry is so huge this year (1300) that there'll always be someone about I suppose.
Drop too far back and you'll get stuck behind all the people pushing on the first off-road bits.
So, a rough breakdown of the terrain is - the first 14 miles all on tarmac, then a climb to 1350 on a mixture of narrow tarmac road, Landrover type track and grassy/rutted moorland going.
The distance to this point is about 3 miles after you turn left off the main road just west of Ballaugh - it's the single longest climb of the event, but the others that come later might seem tougher because you'll have covered more ground by then.
Then a gradual descent from this point, (with some short, sharp climbs after valley crossings) mostly on gravel forestry track with some sections down through fields to the second checkpoint at St Johns, by which time you've lost all the height that you've gained. This is about half-way as far as distance goes.
Then about a mile climbing on tarmac before a stiff climb out the back of Slieu Whallian to the Garey crossroads - it's easy to get baulked here as a shedload of people will be off pushing, probably. A couple of hundred metres of tarmac then a nice descent through Arrasey plantation into Glen Rushen before another longish forestry road climb - then a gravel moorland track to the last highest point (we call this place Point 1119 'cos that's the height there).
Then a longish descent of two areas of moorland, the first with some timber boardwalk type sections and the second finishing by dropping down through farmland before spitting you out on tarmac (again!).
Then tarmac the last few miles to the finish :roll: .
Nothing very technical anywhere really and a route that favours those who are fast over non-technical going (and on the road) rather than those who have good bike handling skills but lose out on top speed. (unfortunately :roll: )
Because of all the road work not an ideal course for singlespeeds,(otherwise it would be ok) which is why I'm not riding this year. It's good enough event, but by no means representative of the best Manx terrain (non of which would sustain an entry of this size, of course).
If you need any more info or, indeed, a support crew on the day, drop me a PM or an email. The same goes if you have a free day or two to ride a few choice (and cheeky) trails while you're over or even if you just fancy meeting up for a beer. You're more than welcome to any help that I can offer.