regarding transferring the miles.. from the Use Miles section:
Buy, transfer, or give miles
Top off miles in your account or give them to someone else. Fee waived transfers coming soon.
Overall, it just looks like another shopping portal to me. But UPS isn't listed on rewardsdb or evreward, so I think it may be a first time for them.
Now, the United PerksPlus program which is listed as a partner looks like an actual business program. Even gives you 5k "perksplus points" for joining via that link.. which according to T&C you aren't even allowed to redeem (if there was something that low on the redemption chart - there isn't) until you've spent 5k on airfare over 3 consecutive months.