I've had a unit since the new design first came out in Fall of 2013. At first I thought it was just a new housing of the original "Old Yellow" DSP model, but instead Pieps really put a lot into new tweaks and improvements behind the scenes.
My favorite improvement upon "Old Yellow" was the flagging feature: Pieps was the first to introduce any sort of signal suppression into a beacon, yet even with firmware updates over the years, "Old Yellow" never flagged reliable for me compared to the competition. But the new DSP Pro has been flawless for me in this regard.
As for more details, I assisted with this review:
http://beaconreviews.com/transceivers/Specs_PiepsDSPPro.asp
Note that in the summary section for all beacons:
http://beaconreviews.com/transceivers/transceiver_reviews.asp
... the DSP Pro is the only model that simply lists "None." for "Cons"! And it really is a nice "neutral" kind of beacon model, appealing to just about anyone, and without any quirks or other issues requiring a learning curve. (Although you should still practice on a regular basis, and also read the user's manual initially.)
Compared to its slightly less-expensive DSP Sport sibling, the most important feature is the frequency tester on the Pro. Unlike frequency testers on other models that just report a Pass/Fail essentially, the Pro reports the actual frequency, which is helpful for checking drift on large fleets of loaner/rental beacons, as well as just informing a partner that a beacon might be kind of on the edge.
For skimo-specific concerns, if you plan to use the beacon without its harness, the length and width dimensions are reasonable, and the corners are nicely rounded. However, the three-position switch does add noticeably to the depth if you were to use it inside a race suit poach. Not a deal breaker, but would be more noticeable than some other models.
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