I own a small Ryobi drill I paid about 29.99 for and it is really no good. You get what you pay for when things are very cheap. I do have a Ryobi bench model drill press that has been a real workhorse as it is set up to bore 3 holes at one time for Blum hinges on doors. We bore approximately 200 hinge holes per month with that drill press and it just keeps on rocking. If my drill press is training equipment, then it must be paid training, and very good paid training at that

Did I mention that my Ryobi drill press was purchased used off of CL, meaning not only have I worked it extremely hard, but in it's previous life in a previous cabinet shop, it has been a great machine.
I would say, based on the good rating it has gotten, that it certainly is worth checking out and using. HD has a very generous return policy as long as you are honest. If it is pure junk then return it, otherwise Ryobi may have just built a nice gun at a very fair price. It certainly scores well in the review column on HD site.
I have 3 Senco guns and no doubt they are great. But much of the time I find myself picking up my 18g Dewalt instead of going to my 18g Senco.
I would say to go for the Ryobi gun at the price point it is offered, if it is junk, then take it back. Of course you would need to add the cost of a battery and charger. That is something that could tip the scales some.