The old case I had was a generic pouch case that cost $20. It was also lateral, but with a wider flip cover. The shape of a lateral case makes it easier to sit down with. The vertical style cases are tough to sit with and the clip-on style has a tendency to swing around too much.
After much use, my old case was ready for retirement. The belt clip was worn down to the metal so keeping it secure on a belt was difficult. Add to the fact that most of the material was wearing away and loose threads were showing up everywhere, it looked rather weathered.
The Sena case not only fits the Treo 650, but also the 600 and 700 series. Since the Treo models are all very similar in size, it would make sense this case was 'universal'. The Treo shown below is about a year and a half old, there are absolutely no scratches on it.
The Treo can be stored with the screen facing in or out. The inside of the case is lined with a felt material to cushion your device. There's enough extra room if you want to skin your Treo, it will still fit.
The only drawback of this case is the earpiece jack being covered by the sides of the case. You can always move the Treo up a little to get access to the jack. It's not that annoying for my uses since I use a Bluetooth headset.
Overall, the Sena Treo 650 lateral case delivers as promised. The case itself is made with high quality leather that feels sturdy and tough. After using it for a month now, it hasn't shown any signs of wear. The magnetic flip cover is very convenient when you need to get access to your Treo.