I purchased the HTC One A9 couple of days ago.
It was like falling in LUV again with HTC. I have been a HTC user for the past 9 years starting from HTC windows phone, HTC Widfire, HTC Incredible S, HTC One X+, HTC One M8 Eye till date.
The Opel silver A9 has a rich feel for the eyes. Looks stunning to hold and will attract envy for others. As far as the UI there is nothing close to the HTC.
Performance wise it is buttery smooth, camera is a big plus, no complains.
The battery status has to be commented after few more days of usage. As of now it is lasting for a day for my usage of 3hrs calls, regular usuage of FB, twitter and whtsapp.
All the HTC phones has very less battery compared to the rest. Thats the only complain I have as an HTC user all these years, but if Iam able to go through a full day without 2nd charge Iam OK with it