Hey, what a thoughtful, encouraging person. I am a moderator of /r/spiders (maybe I know your bf). I use this. Here are some example images of spider features I acquired with this scope's camera:

Leg hairs, you say?

Eye arrangements are important to spider ID. Spitting spider, running crab spider, fishing spider, jumping spider.

Pedipalp structure is also very important to spider ID.

The teeth of the chelicerae of a dwarf spider.

It also takes video.

Bonus butterfly scales... 2x and 4x are the two objective options when using the camera.

One drawback is that the camera is higher power than the scope's eyepiece lenses (what you look through vs. what snaps pics). The camera's field of view on the wider setting is about 1.3 mm. It's too close to get pics of the whole animal. Second drawback is the halogen lamp gets too hot for live arthropods, so I often use a $7 LED desk lamp from Target. I also recommend CombineZP, very straightforward freeware to stack images at varying depth of focus.

Overall, I find what I can see with this microscope and the images I can take adequate in the context of spider identification and admiration. For less than $150, I think it's a pretty good item to have. Best wishes to you and your bf's arachnid interests.