With both DD1 and DD2, I went in with the hope of not needing an epidural (although open minded that if I needed it, Id happily have one) and both times have ended up with the epi.
I had the synto drip with both due to 'failure to progress' (in other words, things stalled and I needed help to get my contractions doing what they should) so my mw recommended an epi each time. I must say, when you are in the middle of painful contractions and have been having them as long as I had (around 40 hours with both girls), the pain being taken away completely is fantastic. I was able to get some much needed rest to ready myself to push. I also didnt feel a thing when they inserted it.
Downsides? I couldnt feel as much as I needed to with DD1 to push effectively and needed the help of vontouse and an episiotomy to get her out. Without the epi though I no doubt would have ended up with an emergency c-section.
DD2 I asked for the epi to be turned off well before pushing and so have a bit more feeling - not painful but could feel contractions which was much better. Still hard to focus your pushing to the right place though. Also ended up needing help (forceps this time) but not due to being unable to push her out (she was stuck because of the way she decended and her size).
Worst thing with both girls was they both needed care in NICU and I was too wobbly on my legs to go and see them initially without being taken in a wheelchair which sucked and made me feel helpless. The effects wore off pretty quickly and I think a lesser dose can get you up moving pretty quick but still something to consider.
It would have been great to get up and shower/dress, wander round, do anything but be stuck on that bed for however long especially when I was worried about my baby.
Post birth with DD1 I had killer headaches for a week and a sore back - both side affects from the epi. Also had the sore back with DD2 but no headaches.
So epi's have their place but also have downsides (risks of them aside). I think you're best to go in with an open mind, try to do it without and if you feel you need an epidural, then go for it. Make sure you look into and understand the risks/benefits and go from there