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I have (and enjoy using) many short-eye relief low-glass eyepieces. For planets at least, I find the eye relief issue pretty much irrelevant because I observe the centre and simply don't need to see all of the field (stop) at all times. My XP3.8 has less than 3mm of eye relief yet is perfectly useable for small targets like planets. It's also much smaller and lighter than the 3.5 Nagler it replaced, ideal for a grab and go kit.
I sold my 7mm Nagler after discovering that a 7m Plössl from the same maker beat it on just about everything that happened within 25° of the optical axis, i.e. where it matters Yes, it was sharper and had more contrast. I've also had good results with barlowed Plössls. A decent quality combo would be no worse on planets than say Naglers but at a fraction of the cost.
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