I had this done on my 159 a couple of weeks ago along with fitting some Nokian winter tyres. Was pretty busy at the time and had more important things to think about, so didn't really get to drive the car too much and didn't just want to post "it's great" for the sake of it and to justify the cost. Spent about a week back in my old 156 (Autolusso courtesy car) while the work was being done (my choice for it to take a week for me to collect the car), so I'd gotten used to really light steering again. The night and day feeling that others have spoken of wasn't apparent to me, sure the car felt nice, I couldnt knock it, but I reckon because of me using the 156 for a week and not being able to recollect (due to only buying the 159 a few weeks ago) how the 159 handled, I wasn't blown away.
It was a few days later when I started noticing wierd stuff going on. I have to do a 3 point turn to get of our driveway, suddenly it dawned on me that it was a really easy manoeuvre. I can also forget the 3 point turn and reverse down my drive, again, it was really easy. The steering felt sluggish and thick before, now in these situations the steering feels clean, I don't even need to worry about how crap the reverse lights are anymore cos I can feel the car, connected with it if you get my drift.
So i was driving it the other night and suddenly I become aware that I'm whipping thru mini roundabouts and intermittent parked cars with only one hand on the wheel, defo never did this before. Can't say I've had a chance to drive it over 60mph yet, but I reckon it's sub 60 where this mod is of benefit to me and my Wife anyway, town driving etc.
So are the Nokians any good? Is it worth getting winter tyres? Not sure really, but the car feels really good and you feel a bit more confident with winters on, so no downsides. Love the car.
Is £500 worth it for this powerlex/Autolusso thingy? Yep, you'll forget about the 500 pretty quickly, but you'll have a clean handling car, personally, I'd get this done as 2nd top of the mod chart after tyres, before dampers, springs, brakes. Drove a 6 month old merc e class estate today, sporty one. 159 way better!
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GT 3.2 V6 - Q2, KONI FSD & EIBACH PROKIT, GTA REMAP, MICHELLIN PS3's, BMC CDA
159 SW 2.4JTDM TI - NO MODS (YET)