After having the L3's which are relatively quiet for mining I can't imagine going to the L3+.  The power draw, heat, and noise would not work well for home mining.  If you are hosted then that might work as long as you have an attentive staff that is willing to help you when issues come up getting stuff shipped off for repairs.  Having the L3's will spoil you as a home miner as far as power and noise levels are concerned.
If I were to buy more of the L3's it would have to be the L3's, and not the L3+.  The size, power draw, and noise levels work fine for home mining.  I can just about bet that the L3+ will be as loud and painfully troublesome as an S9 and that is just not going to work for me.  Best of luck to all who jump on the L3+.  Please do post your experiences here.  It can help everyone to know what to expect.
From what it looks like to me, the L3+ isn't going to be much louder if not as loud as the A4.
I'm considering replacing a couple A2's for 1 of them, maybe 2.
I know you had both and I know you had a ton of issues with your L3. The lack of support options available form Bitmain post purchase is one of the biggest reasons I stopped buying their bitcoin miners. I had issues with my A4 but Innosilicon was fairly timely in helping me resolve issues and it took them longer than I would have liked but they at least took care of me.
When I look through the threads that are frequently found detailing repair or warranty issues with Bitmain hardware, it's really concerning for me and is affecting my consideration of this L3+ -- I didn't jump on the L3 because I had just bought the A4. Now the A4 issues are almost completely resolved for me and I'm looking towards replacing some older A2's.
Noise isn't an issue for me, neither is cooling. The biggest concern I have is post purchase support if there are issues.
If you had to do it all over again, would you have sold your A4?