Unless you need the portability, it's hard to justify paying for the better part of a 'real' scope for a portable but otherwise fairly inferior instrument.
Well, yeah, that's the entire point of this product!
It's silly to compare apples and oranges in this instance.
It's easy to forget just how important "other" factors are or can be in a piece of test equipment.
I work on rally cars a lot, often in what would be considered terrible working conditions (cold, dark, wet, muddy etc) and i've got a trusty Fluke 123 scopemeter i use.
If one were just to look at the price, and the 20Mhz bandwidth, you could be forgiven for thinking "WTF!". However, add in the fact it doesn't break when you drop it (generally ;-) is completely portable, water resistant (not actually waterproof, but mines survived a few serious dunkings in it's time), easy to operate with big buttons (when wearing gloves) and has nice, strong probe connections that are difficult to mis-insert or damage, THEN you see the point of the device!!!