The main difference is that an XL clock can be connected to a DGT e-board and thus can control the chess program or can be controlled by it. The XL is the only clock that can publish its displayed times through software connected with the e-board.
The XL clock can combine any of the known timing methods, such as Bronstein Delay, Fischer Bonus, Byo‑yomi, upcount etc. in different (up to 5) periods.
The 2000 and 2010 are restricted in their combinations and have a maximum of 4 periods.
Tournaments with multiple time controls are restricted for the 2000 and 2010 to a Fischer Bonus system. It is not possible to play multiple time controls with Bronstein delay timing. Of course they support timing systems with no bonus or delay.
The 2010 (successor of the 2000) is mechanically more robust for heavy duty use than the 2000 and Easy clocks.
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