You need to be aware that you will get whatever the local office has in stock.
It is not outside the realm of possibility that they don't have any DOCSIS 3 modems in stock.
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You might want to get 2 and keep one on the shelf. It seems like when I've had one go out over the years it's almost always on a day when the stores are closed or after hours. After the last time I just paid the extra money and decided to keep a spare on the shelf so I'm not scrambling to get my internet back.
I finally found a manual for the Ubee D3.0 modems since Saveology does not send you one with the modem. I wanted to know what all the LED lights indicated, etc., and never got anywhere with them. Plus no installation disk was ever sent to me. So...I researched and found this link which is the manual for the modem. It's very helpful. Wish they'd just put it in with the modem from day one. Google the Ubee D3.0 cable modem manual and here's the one you want .The link will show Model #U10C035 in the header of the link It has a downloadable PDF document that's very clear. Hope all of you that have this modem use this. It will answer a lot of questions.