Upload & Sell: On
I had 35-350L and I liked it. The only problems with it was some softness at 350mm wide open, and a major barrel distortion at 35mm. Otherwise its IQ was fine, the lens was relatively light and small when fully collapsed. AF response was also decent.
For the money, I'd say it is a great lens if you'd use it sufficiently to justify its purchase. Unfortunately I wasn't, so it had to go.
I would agree with your softness comment at 350mm. However, if I stop-down to around f/7.1, it seems to clean it up a good amount. But- 350mm at f/7.1 without IS means I use it outdoors mostly, as would most I would guess.