From a recent ebay sale:
This offering is for a new-old-stock Modolo Flash road bike stem in a size 110 mm. The overall styling is fairly nice...from the cone-style expander nut to the wrap-around design of the stem clamp (with the pinch bolt tucked-in underneath the stem...refer to pictures). However, it's the finish and durability concerns that knock these stems down a few notches...as the finish is a dull gray without any polishing/finishing work.
Concerning their durability, some Modolo stems with this particular clamp design may not be as reliable as other makes/models. We have learned from others that similar Modolo stems (the "Professional" and "Master Professional" models as two examples) were actually factory recalls, because there were real safety concerns over fatigue/failure at the clamp area. This fatigue may begin as a relatively harmless "creaking noise" when it appears the stem is properly clamped to handlebars. However, there are instances where this fatigue area may weaken further...and to the point where the stem clamp may fail to properly cinch down on a set of handlebars. Having said all of this, it is also our understanding these Modolo Flash stems were not subject to a product recall. Still, because there are more similarities then differences when comparing some of these Modolo stems, we have our own concerns. To this end (and regardless of your personal experience with Modolo stems), we thought it was important to include this additional information in the listing. I guess our general thoughts are that stronger/heavier riders that generate a lot of torque around the stem clamp area should consider other (more proven) quill stem options. This is not to say these stems are without consideration, but we would limit those applications to light duty activity where the stem clamp area does not come under significant duress.
Also:
read here
Having posted this, I will also say that I have used a similar design Modolo Speedy stem and have had no creaks or cracks, but I would not subject them to aero bars, either.