The 3 piece anal play kit is really awesome for beginners. They all feel really good, and it's value for money in my opinion. I think any improvements that could be made, would be to make them a little more firm, and I haven't checked yet, but I'm hoping there are medium sized plugs just like this, so once you get used to these sizes, you can use bigger ones.
I LOVE LOVE LOVE the fact that they have that anchor shape at the bottom, because although my colt butt plugs feel more firm and are slightly bigger, they have those huge rectangular bottoms which end up hurting your butt - preventing you from keeping them in for long periods of time. With these plugs, however, because of their anchor shape, you can keep them in for much longer, which is a real positive.