I've been looking through past threads to get a feel for why people use or don't use trekking poles. I don't want to get into this though, so please refrain from making arguments for or against trekking pole use (assume I am going to try trekking poles regardless). Recently picked up a Duomid as my first trekking pole supported shelter, and so I've decided to take the plunge and try out some trekking poles (for hiking too). I'd really appreciate some guidance from those using trekking poles. Here is my criteria and potential uses:
1) sufficiently durable to support a Duomid under low/moderate snowloads. I don't hike in the snow much but in the shoulder season I do occasionally find myself waking up to several inches of snow. Preferably 55" in length and flicklock adjustable so I don't have to buy/bring a pole extender. I've read too many accounts of slippage on twist-locks but if someone can convince me otherwise…
2) I'm going to try and use them for hiking too so I'm not looking for a single staff or a pole that is only a shelter support (ie. Ruta Locura CF poles)
3) poles will ideally be under $100. I've never used trekking poles so I don't want to invest in something like GG LT4's just yet (I think…)
One option is to go through REI next month with the 20%-off coupon plus a modest dividend (hoping for around $20 to $30 this year), or I could go to Walmart and pick up the cheap Outdoor Products Al. poles (this is my number one option thus far)
4) poles should be able to withstand user error considering I am new to them; wouldn't want to snap an expensive CF pole my first time out because I was just being stupid and using them incorrectly. I think I want straps based on user comments I've read.
5) Lastly, those of you who have fully converted from cheaper/heavier to more expensive/lighter trekking poles, how quickly did you find yourself becoming frustrated (if at all) with the weight of your cheaper/heavier poles? Based on what I read many people claimed that moving from heavier poles in the 1 pound + range to lighter poles was a significant improvement.
If I could get some recommendations that fit within the criteria/potential uses I've outlined that would be great! Thanks
PS: does anyone have a video they could recommend on the Nordic walking method (or whatever it's called; like cross-country skiing but w/out the skis and snow)?

