The Ohlins shocks are very good indeed. Don't expect them to suddenly transform the three wheeler into a race prepared Caterham or an S-Class but the improvement in ride, control and speed particularly on bumpy roads is impressive.
If you read back through this thread you'll find that there are some issues with getting them to fit; nothing drastic and more to do with the vagaries of the assembly of the three wheeler chassis and running gear. One thing that I did find and sort out and have discussed with various people but can't find referred to in this thread is that the upper bearing/bush housing on the front shocks is slightly big for the available space between the mounting bracket hole and the vertical chassis tube. This can interfere with the shock's freedom to move, putting a side loading on the piston rod leading to early seal failure. Preventing this is simple; grind or file about 1mm off of the housing at the relevant point where it fouls. I also checked on assembly that there was no contact by putting the weight of the car back on to the shocks and checking for clearance with a feeler gauge before tightening the top mounting bolts.