I guess it really depends on the price you pay for electricity there in CT. Here in California, the Abyzz pump could could save you an addition $50-75/month. so it would only tanke you 3 years to recover the costs.
Yeah, the Abyzz would get me right about the same net flow as my PW250 and I've done the math. At $0.085/kwh the answer is about a decade.