A pushy, hurried seller is definitely a red flag and I would generally not advocate foregoing or rushing DD. However you noted that this is an MBO so presumably your clients would have or have access to much of the information which would be requested in a traditional DD. So a limited DD may be less risky and even advisable. Their could be priority placed on having robust Reps, Warranties and Indemnities in the SPA to provide comfort for any issues not disclosed in the limited DD. Consider also a sizeable escrow as protection. I agree with some of the poster above who highlighted that the rush can allow for room to negotiate on price.