We will try out the tips found proposed in this topic. If they don't give the expected results we might purchase a gently used Juki MCS-1500 that our dealer is selling.

End of August our dealer is expecting the new Janome 3000P-CPX. But not sure if the improvements of this "professional"Coverpro will make a real step-up to the 2000CPx.

Add: in the meantime we found a new owner for our Janome 2000CPX we lost confidence in and bought the gently used "as new" Juki MCS-1500. The Juki seams less picky and take seam intersections with ease.

My new Janome arrived today, got it out of the box, read the manual, threaded it and did a test and its just perfect, first time! Very happy so far 

It's a great little machine! Happy sewing 

I can understand it must be a great disappointment for you!

I always had mixed feelings about the allround computerised Juki sewing machines. They feel cheap and some people report the Juki customer service is not that good either.

Our dealer sells Juki but for sewing machines he much more prefers Janome and Brother, except for the overlockers.

The Atelier S5 is the entry of the 9mm SM and works with a normal high shank walking foot, whereas the Atelier 7 has the Acufeed Flex system (broad and narrow) that works in conjunction with the feed dogs.
The Atelier 7 has more stiches and buttonholes than the S5 and of course more accessories that comes with it.
See https://www.janome.co.uk/atelier-7 for the SM and https://janomelife.wordpress.com/2018/05/08/janome-acufeed-flex-what-exactly-is-this-and-why-do-i-need-it/ for the acufeed flex system.

Is the S7 worth the extra money? No idea, it depends of your needs and with what type of SM you feel comfortable with. I prefer the easy interface of the S3 and the S5, but that is merely a personal preference. DH works with a Janome 8200QCP SE with comes with the same interface as the Atelier 5 and has the acufeed flex system, so i am at ease when switching from one machine to another. The only minus with the narrow acufeed flex system is that you can't start at the beginning of the fabric when sewing, so not so ideal for garment sewing. You do not have this problem with the broad acufeed flex as the design of the foot is different from the narrow one.

Maybe you could be a visit to a nearby dealer who carries these Janome sewing machines to try them out?

@Wychall

Impressive collection you have there! Do you still use the SM on display on the shelves?

With a trade-in at the dealers you seldom get good deals. Perhaps you could try to sell the machine(s) you use the least privately?

Regarding your decision which sewing machine to let go, you could make it once you get your new Bernina and see what of you other machines you are not enclined to use regularly anymore.

We use all sew Gütermann polly thread for the computerised SM, so it's interesting the brand launches this 100% recycled thread.

For the (c)overlocker we use the rather cheap Diamond Spun (cones of 3000 yards) that is sold on worldofsewing.com  We have absolutely no idea if this is a good thread and where it's made.

I am confident in joining this sewing forum, but not so much in my sewing capabilities. It's partly my fault: I am rather impatient by nature, want to master a skill in a short period of time and everything needs to be perfect.

I am glad that my husband likes to follow sewing courses (sewing techniques, pattern drawing & general sewing) so I can learn at home on our own sewing machines and get support from him