I searched for half a dozen apps and none of them fits my requirements. It's driving me crazy. What I need is simple: 1. Vertical continuous scrolling 2. Allows me to bookmark my annotations 3. Not buggy I paid for both Good Reader, PDF Expert after reading rave reviews and was disappointed to find out that they only provide page-by-page vertical scrolling and not continuous vertical scrolling which I so need. PDF reader and PerfectReader has want I want, but they are so damn buggy and slow that I have to remove one and keep the other one but only as a free trial copy. Any recommendations?