I went with the same kit for my sherline 5410. There isn't much mention of Probotix on here aside from this thread. The unipolar drive seems well matched to the fine pitch leadscrews. Probotix quickly answered emails and their website is clean/modern while offering all the cables/buttons/plugs etc on their webstore. One stop shopping at its best.
A fellow hobbyist suggested i get whatever is affordable and start making chips. Spending big money on other equipment is only going to offer minimal gains.