I have friends who love the bottles. I agree that I don’t feel like I have control. I feel like I have more control with tips. I know tipless bags aren’t designed for couplers, but I use them. They work better because the bag is thinner.
what I would suggest as a tip is what I learned years ago from Karen Summers, when she had a website and before CookieCon. She took prepared icing, put it is plastic, rolled it up and then using both hands twirled it so it was twisted tight on both sides. Then you can drop it in a piping bag and cut off the end going through the coupler. It makes clean up much easier and frequently I can use the bag several times. It also helps if the bag bursts. I hope explained it correct. I’ll have to look for a video.