it's a good investment. i bought 1 2 yrs ago n never regretted. i bf for 1 yr and lend the set to many many friends already. it's still in good working condition and i'm keeping it for #2. definitely worth the $$ if you intend to feed for more than 4 mths.
1 breast pump = $800
1 month formula milk = $200
therefore it'll take you 4mths to breakeven, worthy investment