We made measurements with different types of MCP PMT as shower maximum detector. The measurements were performed at the Fermilab Test Beam Facility with 120 GeV/c primary proton beam and 12 GeV/c and 32 GeV/c secondary beams. We obtained time resolution for the SM detector based on Photek 240 at the level of 20 – 30 ps. The SM detector, based on the Photonis MCP-PMT, also achieves a very good TR, ~35 ps. We feel that this level of performance, even with a large MCP pore size (diameter ~25 μm), enables the development of SM detectors for collider experiments at a potentially much reduced cost. The success of the LAPPD project [2, 4] in developing affordable MCP’s is encouraging in this respect. More savings are possible if it can be shown that bare MCP’s without an associated photocathode, can give similar timing performance. We plan on performing a future beam test that can resolve this issue.