Below are the three flash drives I tested.
Patriot Xporter XT Boost 8GB Flash Drive (USB 2.0 Portable) Model PEF8GUSB - USB 2.0
Lexar JumpDrive Triton 32GB USB 3.0 Flash Drive Model LJDNV32GCRBNA - USB 3.0
CORSAIR Voyager GT 64GB USB 3.0 Flash Drive Model CMFVYGT3A-64GB - USB 3.0
ADATA USB 3.0 Flash Drive, S102 Pro 16GB - USB 3.0
Lenovo T430s (mSATA SSD 128GB, 8GB RAM, Windows Server 2012)
Crystal Diskmark, 64 bit version, 3.0.2.
All drives were formatted as FAT32
Below are the results.
Based on the results below, it appears that the performance of these drives when connected to a USB 2.0 port is more or less the same.
BUT, when used with a USB 3.0 port the results were as I expected (based on reviews). The Lexar drive wins hands down in terms of sequential R-W performance.