I recently had the misfortune of dealing with MPB.com, and my experience has left me thoroughly frustrated and disappointed. I placed an order for a Tamron SP AF 200-500mm f/5-6.3 Di LD (IF) lens for Nikon F Mount, specifically opting for 2-day shipping to ensure its timely arrival for an important event. However, what I received was far from what I had ordered. Despite the order, packing slip, and even the sticker on the lens cap indicating it was for Nikon, I was shipped the Canon mount version of the lens. This error rendered the lens completely unusable for my intended purpose, causing me to miss out on capturing crucial moments at the event. In the aftermath, I reached out to MPB.com's customer service immediately, only to find them closed for the entire weekend. It wasn't until Monday morning that I could speak to someone, and while they agreed to exchange the lens for the correct one, the process was anything but smooth. Upon finally shipping back the incorrect lens, which took a frustratingly long seven days to reach them (partly not their fault, but nonetheless indicative of a lackluster system), I expected expedited service for the replacement, given their mistake and my prolonged inconvenience. However, I was met with disappointment yet again. Despite my insistence and the clear responsibility on their part, MPB.com insisted that only the initial order was eligible for expedited shipping. It took persistent prodding from my end to finally secure overnight shipping for the replacement lens. Even then, the promised shipping notifications were woefully inadequate. The promised overnight shipping turned out to be nothing but a false hope, as I discovered my package was sent via FedEx Ground, adding another agonizing week to the wait. Throughout this ordeal, MPB.com demonstrated a complete lack of proactive customer service, with every effort on their part spurred only by my repeated inquiries. In summary, my experience with MPB.com has been a nightmare from start to finish. Their incompetence in shipping the correct product, coupled with their indifferent attitude towards customer satisfaction, has left me deeply dissatisfied. I strongly advise others to think twice before entrusting their business to MPB.com.