I have to agree, that doesn't look very easy to grab in a hurry. Add in the strap and it may just slow you down more. I very much think you could train with it and eventually get comfortable and you may already have. It just wouldn't be my first choice, nor are most nylon holsters very good fitting. I think that's important too. Of course you're talking to a guy who uses a Serpa, which not all that long ago on the internet would be like announcing you thought ISIS was a good idea (note to the NSA viewing this..I hate ISIS).
Ultimately you've got to do what you think is best for you, all I can give is advice based on limited experience in the matter. If a nylon holster is what you can best afford, keeps you from leaving the gun at home and keeps the gun from falling on the floor, carry on my friend.