the old M15 and M37 but then in SMT (parts)
unknown if Plan B was sold or this is a licencing of the designs?
the oscillator in particular is very good (I got a v2 and v2.5), though there are more options out there now that have a triangle core than 3 years ago. Bubblesound for instance, and Intellijel.
it would be interesting to hear the old (good) M15 next to the new one. (SMT does sound a little different?)
Peter Grenader from plan B did license these two designs. he has nothing to do with them otherwise. apparently there is a deal in place for the fees for licensing to go to pay off debts of Plan B. there are a handful of people who are owed not small sums of money by Peter so the fact that this is going to pay off some of those debts is a very good thing. anything to square the ugly chapter of Plan B's history is a good thing.
plus, the M15 is a really nice sound oscillator. i have the last plan B rev of the M15 and dig it a lot. can't say i care for the new panel design. glad i have the older one.
cheaper doesn't make it bad (at all), just less functions in one module and sometimes a different sound.
there's some very good modular stuff in the lower pricerange, often overlooked. the cool thing about a modular is that you can build unique complex sounds with a chain of simple modules.
another route is DIY. both in 5u and eurorack. you can save a LOT of $$
the M15 is nice though, it's got balls. the new colorsceme is something you love or hate. lol