I still have a pair of the original DA20s. They play 90m tapes flawlessly. The only rare issue I've seen is that if I try to unload a tape too quickly after hitting stop, the mechanism will sometimes leave a small loop of tape exposed. This has been the case on both decks since I bought them new and both have been serviced and are known to be in operating within spec. I had the same issue with my D7. If I hit stop and the wait a second for the transport to settle before hitting eject, it does not happen. I vaguely remember someone posting that MKII doesn't do this.
If Paul Plotnik is still servicing these and your new deck hasn't been tuned in a while, it's cheap to get a calibration and lube.