I put one in probably 2+ years ago. It's obviously not as good as a MB one but the MB one was what, $240 vs the URO which was $32 or something?

I've had no leaks from it. Mine's a w124 so maybe that makes a difference. I see some of the remarks from others that they're junk but yours is a W123 model.

For the savings, try it and if it doesn't work, return it for a refund. Paypal gives you a 6 month warranty period on many purchases.