1) you have to change the staples to the longer staples in the extra staple boxes. Otherwise it will not staple 30+ pages.
2) There is a learning curve on stapling 40+ pages. If you do not staple it fast enough or the papers aren't packed tight, it will fail.
Overall, still a cost effective buy. The stapling of 30+ pages will never be that simple unless there is a spare $100+ for the higher quality, which would not staple the middle of the paper.
The 790 Long Arm Stapler – our top-of-the-range Long Arm Stapler, feature rich and ideal for stapling booklets thanks to its 300mm (12″) throat depth. With a 717 Spinna head unit this stapler offers the same high performance, reliability and features as its desktop sibling; easy, trouble free loading thanks to its push-button release front-loading mechanism with a braking system to control the magazine ejection and a rotating anvil to switch between stapling and pinning (for temporary fixing). Highly capable, the 790 Long Arm has a capacity of up to 50 sheets (20lb paper) and is ergonomically designed to ensure ease of use. This Long Arm Stapler offers easy stapling of up to 50 sheets (20lb paper) when using Rapesco 26/8mm and 24/8mm staples a calibrated, adjustable paper guide. Manufactured to exacting standards to ensure years of trouble free use, the 790 Long Arm comes backed by a 15 year Guarantee.