I too have a - VERY old - corded Dremel. I think it's great and have never had a moment's problem with it.
OTOH:
1. A couple or so years ago I found a Dremel "Trio" router/cutter thingy (I don't think they're made any more - probably just as well!) as a "shop-soiled ex-display unit, no carry case". After a quick chat with the manager I got it for 75% off the displayed price - roughly 20 quid equivalent if I remember rightly. BUT not only is the collet chuck a "silly" (unique to Dremel) dia, but after not too much use the bearings are starting to get noisy - not a major job I'm sure, but currently "lying on the side for a one fine wet day" job! Also, when in router mode, the depth adjustment is just is just plain "carp"! But with care, it does do the job/s I've asked it to, and being no "professional" myself I don't work to a deadline.
2. Over the years there have been several posts here by dissatisfied users, particularly regarding the battery-driven drill models (which I've never tried).
I've also heard rumours (on here amongst other places) that Dremel has been "taken over" (or otherwise changed things) with some other company (Black & Decker???), and that most/all of their stuff is no longer made in the USA.
YEARS ago I also had a Dremel "Moto Tool" "sort of scroll saw thingy" and still own and regularly use a small disc/belt sander by Dremel. My own experience of both of those, and of the above mains drill, is that the quality of all these tools was/is excellent.
But based on points 1 and 2 above, my GUESS is that with Dremel nowadays, "fings ain't wot they used to be"!
BTW, Proxon drills (and their other tools) have a very good reputation here - Switzerland) but are also VERY expensive here (their little mains drills are roughly double Dremel prices).
So would I buy Dremel again?
I doubt it - in view of the comments above - but as above, with a bit of work and a pair of bearings, I reckon my above Dremel "Trio" (and the disc/belt sander) will outlast me now (I'm 75). For 20 quid I cant grumble (and at the time, those "Makita-look-alike" palm routers weren't available). "Smug so-n-so" I hear you say!
But as said, I think Dremel's "bean counters" (plus no doubt their "marketing flower arrangers") have significantly the quality of what was once a generally excellent product range.
BTW, I also have an Aldi/Lidl (I forget which) mains mini drill which I use almost exclusively with a flex drive shaft (which was included within the "kit"). Whilst it's clearly not as good a piece of tooling as my Dremel mini drill, it's already outlasted the 3 year guarantee, and as it was a really silly cheap price (about 25 quid equivalent???) I don't think it will owe me anything if it blows up tomorrow.
Many people here decry the Aldi/Lidl tools generally, but my experience has been generally good (for the price) and with a 3 year warranty, if you haven't got the budget for a Proxon, maybe worth a try next time they have them in stock?
HTH