I'm not sure, as I am new to their brand. I'm not a huge fan, but I like my Tyndall as one of many different looks in my collection. It is one of the few I own that are Swiss (in the legal definition of the word), in addition to Tissot, Tag Heuer and Glycine.
They have only one case, but there are three different dial configurations, each with three different versions, as well as a couple special editions of the Tyndall the last couple years. Sure, that is not prolific, but if they have something good, no sense diluting it just for the sake of adding something different.
My take on it is that Xetum is into marketing and selling watches, and if they are a one-trick pony, so be it.
Here is my Tyndall I've been wearing today.
Regards,
David (soopah & La Londe Watch Co.)