The difference in thickness and weigh from the earlier version makes the ipad2 more comfortable to hold .这里的动词不定式to hold作什么成分.

The difference in thickness and weigh from the earlier version makes the ipad2 more comfortable to hold .
这里的动词不定式to hold作什么成分.

to hold 作补语,来说明“什么样的舒服”,即“拿着/握着很舒服”.
翻译：
厚度和重量的不同使得ipad2相比之前的版本拿着/握着感觉更舒服/轻巧.
make sth adj 使某物怎么样
make sth adj to do 使某物做什么时（感觉上）怎么样

to hold应该是作为副词来修饰comfortable这个形容词的。

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