This battery pack / thumb drive / stylus pen is trying too hard

I usually like multipurpose devices. After all, why carry two things when you can carry one that does two jobs or more? That’s just good common sense. But for some reason, the ChargeWrite pen has me uneasy. It’s a $29 device that has a pen, a stylus, and 1,000 mAh battery pack with a universal Lightning and Micro USB jack. A more expensive $39 ChargeWrite+ lowers the battery size to 650mAh, but adds 16GB of flash storage. Those are all good things. But how well do they work when cram