If you're planning on making a large purchase it makes sense to get this level of membership. I tried it out for a month, however the monthly giveaway never happened so if you're also purchasing for the giveaway (at any prime level) or that's a big reason for you making the purchase, it apparently doesn't always happen. It's been almost 2 full months since the last one so just FYI. Otherwise the shipping and discount is a good deal as long as you're making purchases during your membership period. I'll probably only purchase this tier when I'm making purchases, and lower tiers for shipping of group buy items.
Giving this 4* overall since the marketing is a bit misleading in this case. If the giveaways aren't able to be run on a consistent schedule then it should probably be removed or reworded to give an accurate expectation. If it wasn't included I'd be giving this a 5* review.