Had a go on a Tuono before I brought my S4r, great engine handles well but a bit tall for me, felt more comfortable and in control on the S4r so brought that
Had a M1000 for a day while the S4r was having a service, was a very good bike loads of grunt and on a twisty road would stay with the S4r, was still glad to get the S4r back though
Have a look around as there are some S4r's about secondhand now at quite a bit less than the £8k new price
Darren