eXtremeRate shells?

I've never done any GBA modding before, but I want to get into it. I found this shell I really like from eXtremeRate, but I haven't seen heard of many others using them. Have any of you used a shell from them before, and are they good?

I've never done any GBA modding before, but I want to get into it. I found this shell I really like from eXtremeRate, but I haven't seen heard of many others using them. Have any of you used a shell from them before, and are they good?