The ATN X-Sight 2 might be another consideration for your friend, if he has an understanding of navigating menus etc. I purchased the 3-14x model earlier this year and actually like it, despite all the negative publicity that surrounds it as well as actual problems the scope has sometimes. I myself have criticized the scope in the past and still recognize that it has some issues, but it's a pretty darn good scope overall in my opinion, especially for the price point. Mine is currently back at ATN due to locking up and buttons not working. Of course, I know of a few Photon scopes that had to be returned to the company as well, so there's no guarantee on any of them that they will be trouble free.
The X-Sight 2 gives color day mode and either black / white or green color at night, you can choose in the scope's menu.
I have owned two Photon models, both XT's. The Photon is more simple to use than the X-Sight, but for both day and night use, the X-Sight gets the nod from me. I especially like the ballistic calculator in the X-Sight that has really impressed me with just how accurate it is at varying distances.
If deciding on the X-Sight, I would get the X-Sight 2 and not the new 4k at this time. The 4k has several issues at the moment from what I read. It hasn't been out long enough to get the bugs worked out. Also, the 3-14x model of either X-Sight scopes will most likely serve you the best, unless you will be shooting at extreme distances. I looked through the 5-20x model also and it is just too much magnification and little field of view for me.
Sightmark / Sellway company (Photon) has good customer service, but ATN has not fared so well in the past at least. Soon I will know if their CS has improved now that they have a new CEO.
All digital scopes will require a good illuminator, so that is another consideration.
Anyway, just my 2 cents worth and to give you another scope to think about.