Added extra info to the readme

README.md

@@ -8,8 +8,15 @@ implementations:
 - https://github.com/ashkrit/blog/tree/master/FastObjectPool
 - https://code.google.com/p/furious-objectpool
 
+
 The faster implementation uses UNSAFE, which is unavailable on android and non-oracle JVMs, in which case the
-fallback pool is used, which is based on a LinkedBlockingDeque.
+fallback pool is used, which is based on a LinkedBlockingDeque.  
+
+
+If the list gets hot and contended, you can get scaling bugs. It gets complicated too fast and is not 
+worth it for small to even moderate sized objects.  
+
+Use it only for large objects.  
 
 - This is for cross-platform use, specifically - linux 32/64, mac 32/64, and windows 32/64. Java 6+