I don't consider pure protein a meal replacement, personally. The addition of vitamin/minerals (isopure) doesn't a meal make, either.
Look for
- Protein blend (mostly milk proteins)
- 3-6 grams of healthy fats (safflower etc, NO creamer/hydros)
- <20 grams of complex carbs (not maltodextrin)
Myoplex, Met-RX are decent brand names, but there are many other good choices. Advanced Delivery Systems makes a good one with lots of anti-oxidants. Ergopharm had a good one a few years back. Watch out for ones that have > 6mg (35% RDA) iron, as too much supplemental iron is not desirable. This is my biggest gripe with meal replacement and ready-made "weight gainers".