I've had my manual Spyder for almost 10 years. It's a classic but being a 2003my it has a number of upgrades - stiffer chassis, (they foam filled the box sections) glass rear window, V8 badges on the wings, integrated radio aerial etc.
I also have the optional carbon fibre pack - steering wheel, gear knob and door fillets, which I have not seen on any other car.
I've taken it to Italy a couple of times and it takes all that high speed cruising stuff in its stride with ease. GPS said I did 172mph.....
Stelvio Pass was a hoot, - get your lines right and you can really chuck these things about. I remember a certain Michael Schumacher being rather impressed by the Spyder at Fiorano, so the idea that these things don't handle or are just floppy cruisers is wrong.
These cars are VERY sensitive to suspension set up and tyre choice. I had Gary Tait set mine up to be more neutral at the front end. This, coupled with some Michelin PS4s improved the handling and general ride to an amazing degree. It also fixes the inner edge tread wear issue.
Scuttle shake is not an issue with the stiffer chassis (it is on the earlier ones) , and the manual box is great fun on a twisty road. Many people run these on a budget - cheap tyres, scrimping maintenance etc, and this will bite you eventually.
I've put 40k miles on mine during my tenure (its now at 66k) and it's never broken down left me stranded. I've never even had a warning light - but I did have to do the heater matrix this year!
What can you say about future values? It's the last V8 two seater manual transmission Spyder that Maserati made, and it's already really quite rare... Buy one whilst you still can...