My suggestion would be to listen to it to help you make a decision. It would be very hard to determine whether to make the switch even based on the impressions of someone that has heard both. At a certain level of audio product, what's "better" becomes much more subjective.
I have not heard a SME Model 10, but I have listened to a well set up SME Model 30 for several hours. While I admired the sound quality for attributes that audiophiles care about (darkness of background, speed of transients, precision of its sound quality), it didn't move me. On the other hand, I loved the sound of a Rega Planar 10 set up in the same shop and in the same room. I would be happier having the Planar 10 than the SME Model 30. So I think you need to listen to the SME Model 10 to decide how you feel about it. The SME certainly seems to be built well, but that shouldn't be a deciding factor about a certain price point.
I have not heard a SME Model 10, but I have listened to a well set up SME Model 30 for several hours. While I admired the sound quality for attributes that audiophiles care about (darkness of background, speed of transients, precision of its sound quality), it didn't move me. On the other hand, I loved the sound of a Rega Planar 10 set up in the same shop and in the same room. I would be happier having the Planar 10 than the SME Model 30. So I think you need to listen to the SME Model 10 to decide how you feel about it. The SME certainly seems to be built well, but that shouldn't be a deciding factor about a certain price point.