I bought this one from Amazon. It was more expensive, but probably close to the same product:
Amazon.com : Wireless Digital Microscope, Skybasic 50X-1000X Magnification WiFi Portable Handheld Microscopes with Adjustable Stand HD USB Microscope Camera Compatible with iPhone Android iPad Windows Mac Computer : Electronics
www.amazon.com
These USB microscopes can produce some beautiful pictures (please attached). The problem though, is the slightest bump of the unit will send what you are trying to capture out of view. I think part of the reason it's so touchy is because the magnification is so high. That tabletop stand it comes with is crucial for stabilizing the microscope. Unfortunately, the stands are made of cheap plastic so you must be careful with them (my stand broke eventually). The devices lend themselves much better to photographing dried bud on a table as opposed to wet bud attached to a plant.
For the price, I think they are worth picking up. You can have a lot of fun exploring the surface of these flowers, and it takes videos too. But, I would recommend thinking of it as more of a toy than a tool. Due to the issue I mentioned above, it doesn't seem like a worthy replacement for other methods.
I do also own a Carson Pocket Microscope which is similar to your second shot. I think it's a little easier to use due to how compact it is. And, you're not trying to take photographs at the same time (it can't). My Carson starts at 60x, so I run into a lot of the "in focus, then suddenly gone" thing. Maybe since the one you picked out starts on a lower magnification, you won't have that issue as often. So far, have found either a lighted jeweler's loupe or a camera with a powerful macro mode is the easiest way to view trichomes on a live plant.
Strain-wise, the first two attachments are "Wonka Bars" while the second two are from an "LSD-25" Auto-Flower.