The Ultimate Support JS-MB100 Medium Keyboard Bench is a popular mid-range X-style bench designed for keyboard players who want a mix of comfort, portability, and stability.

Key features

• 2-inch thick padded seat for long playing comfort
• X-style steel frame with a dual-locking system for stability
• Height adjustable (4 positions per side / up to 16 combinations)
• Supports up to 200 lbs (≈90 kg)
• Folds flat for easy transport and storage
• Medium size seat: about 21" × 9.75"
• Weight: ~10.8 lb (light enough to carry easily)

Adjustability & comfort

The bench is designed so both sides must be set to matching height holes to stay level. That gives you multiple usable height settings (commonly described as 4–8 main heights depending on interpretation). The padded seat is relatively firm but adequate for gigs or practice sessions.

Build & stability

• Steel X-frame keeps it fairly rigid
• Dual-locking mechanism helps reduce wobble
• Stable enough for typical keyboard use, but still lighter-duty than heavy piano stools

Real-world feedback (from users)

• 👍 Comfortable for short-to-medium sessions and portable setups
• 👍 Lightweight and easy to fold/store
• 👎 Seat is a bit narrow for larger players
• 👎 Some users report slight wobble compared to heavier piano benches

Price range

Typically around $60–$80 USD depending on retailer and region.

Bottom line

The JS-MB100 is a solid gigging/practice bench: portable, affordable, and comfortable enough for most players. If you want maximum stability or a wider seat for long classical-style practice, a heavier piano bench would be better—but for typical keyboard setups, this one does the job well.