It helps to understand that LTE+ is what Sprint used to term Spark.
Spark is nothing more than a Sprint market with all three LTE bands (25/1900mhz, 26/800mhz and 41/2.5ghz) plus CA (Carrier Aggregation).
So, LTE+ is nothing more or less than Spark, it's just that Sprint renamed it because it was causing confusion.
That said, the speeds Sprint advertises for it are attainable under optimized conditions. The general experience will probably average out lower, but will indeed be faster than those markets where Sprint has yet to get all three LTE bands working effectively.
Don't get taken in by the hype.