Maybe somebody can help me deciding on a Quicksilver Silver 60

Hi Everybody,

I run into a good pair of Quicksilver Silver 60's and I need some help to decide if I buy them or not. Currently I am using (for my tube gear) a pair of Quicksilver Mini Mites which I alternate with a pair of Quicksilver Mono M60.
My questions are:
- Are the QS Silver Sixty's a noticeable upgrade over my current tube amps?
- How do the QS Silver 60's compare with the Quicksilver V4's (which ultimately is the upgrade I am looking for)?

Thank you in advance for any help.

Best,
R