My 440 is six years old and the least picky machine I've ever owned. It's predecessor on the other hand I could cheerfully have flung out the window on more than one occasion (a 153)!
The messages that come up telling you to oil and to bring in for maintenance are all based on the number of stitches the machine has done and nothing to do with there actually being a problem. If you press clear when you turn it on it goes away and after three times no longer appears until the next time the stitch count triggers it.
I did cause my hook problems on the 153 by using a needle brand that was slightly longer than Schmetz / Bernina needles. Since it was the old composite (black plastic) hook it got scratched and kept catching my threads. I found out on the Internet that there was a metal replacement so I rang London and ordered one, so that finally sorted me out on that one.
I wouldn't really even look at another brand now.