I got one of these yesterday as a birthday gift. It came with a small pack of razorsmade by, of course, Merkur.
I couldn't wait to try it out. So, this morning, I did.
I prepared myself in the usual manner (see The Routine) and went to work with my '67 and an Astra blade over Musgo Real shave cream. I used the trimming razor on the first and third passes. It worked brilliantly, making easy work of the small, hard to get to areas right under my nose. The wider side seemed to work a little better, while the smaller side was a little difficult to get proper placement with.
The blade wasn't the best - there was a lot of tugging and it almost felt like dry shaving. I think this might have had to do with my technique though. I will be using this daily so I will have plenty of time to refine my methods.
It is also easy to misjudge the angle with this because the head is sort of oddly sloped. Once I get used to it I don't think it will be an issue.
If there were competing blade manufacturers for this razor I'd jump at the chance to try them out, but I'm pretty sure Merkur is the only company making them (it is their product after all).
So, minor blade dissatisfaction aside, the Merkur Trimming Razor is everything I hoped it would be.
Trimming Razor - day 2
Still a bit of pull and tug, but it seems to be limited to the initail pass with this tool. It's still a little hard to figure its nuances as far as blade angle and such, but it does an admirable job of clearing the moustache area.