They have the "Best" prices online that you can get without coupons. Their shipping is fair but not great for he price. In the end, An order shipped by Massnutrition will cost you 8-10% less than competitors even with coupon codes on the competitors.
I did not have any experience with customer service so I cannot rate them accurately but I did like the order feedback and the shipment tracking.
One last thing is that MassNutrition when shipped via UPS does not require signatures for delivery which is nice because I am never home during the day.

Massnutrition.com has the best prices and the best variety of the products I use. The only downside is all of there custormerservie has to be done by email with is a drag. Shipping is priced on weight so its fair. Overall pretty good supp retailer.

They've got the best prices i've found, and they usually ship within 4 business days. They're selection is pretty good. There've only been like two things i haven't been able to find there. If your lookin for somethin, check em out cause they usually have it at a really good price (usually like 50% retail)

best deal in the world if you get spend $200 to get free shipping. They have a smaller name brand inventory but it works for me.

Ok these guys do have good prices, I'll give them that... but their service is the WORST I've ever expericenced. I ordered some supplements that arrived in destroyed condition, and would not have been able to know that untill opening the containers. Nobody from customer service would repond to this despite numerous e-mails and calls, untill one day someone blandly told me that I won't get a refund. So the message I recieved was "yeah we sold you a defective product, but too bad because we're not going to give you a refund...". The product I ordered was VPX BCAA EX, and the bottome half of the pills where smashed into powder when I opened the bottle.

They dont have everything, thats why I gave them a 9 for selection, but for the products that I do buy, I find they have the best prices overall and very fast shipping. I ordered my product on a friday and had it by wednesday morning, not bad considering I had to wait over the weekend for the order to go through.. highly recommended

I usually buy from DPS Nutrition and find them the best overall price, but depending on what you are buying, you may like Mass Nutrition better. I sometimes buy from both companies. Check it out for yourself, it's worth the chance.